Add 'explicit' qualifiers to single-arguments ctors

Just noticed that some single-arg ctors in the codebase missed the explicit qualifier.

BUG=
TBR=armansito

Review URL: https://codereview.chromium.org/1148943005

Cr-Commit-Position: refs/heads/master@{#331595}

android_webview/browser/aw_printing_message_filter.h

@@ -13,7 +13,7 @@ namespace android_webview {
 // renderer process on the IPC thread.
 class AwPrintingMessageFilter : public content::BrowserMessageFilter {
  public:
-  AwPrintingMessageFilter(int render_process_id);
+  explicit AwPrintingMessageFilter(int render_process_id);
 
   // content::BrowserMessageFilter methods.
   void OverrideThreadForMessage(const IPC::Message& message,

android_webview/browser/scoped_app_gl_state_restore.h

@@ -25,7 +25,7 @@ class ScopedAppGLStateRestore {
     MODE_RESOURCE_MANAGEMENT,
   };
 
-  ScopedAppGLStateRestore(CallMode mode);
+  explicit ScopedAppGLStateRestore(CallMode mode);
   ~ScopedAppGLStateRestore();
 
   bool stencil_enabled() const;

components/cloud_devices/common/printer_description.h

@@ -313,7 +313,7 @@ struct Media {
 struct Interval {
   Interval();
   Interval(int32 start, int32 end);
-  Interval(int32 start);
+  explicit Interval(int32 start);
 
   bool operator==(const Interval& other) const;
   bool operator!=(const Interval& other) const { return !(*this == other); }

components/invalidation/invalidation_service_android.h

@@ -29,7 +29,7 @@ class InvalidationServiceAndroid
     : public base::NonThreadSafe,
       public InvalidationService {
  public:
-  InvalidationServiceAndroid(jobject context);
+  explicit InvalidationServiceAndroid(jobject context);
   ~InvalidationServiceAndroid() override;
 
   // InvalidationService implementation.

content/browser/devtools/worker_devtools_agent_host.h

@@ -38,7 +38,7 @@ class WorkerDevToolsAgentHost : public DevToolsAgentHostImpl,
   bool IsTerminated();
 
  protected:
-  WorkerDevToolsAgentHost(WorkerId worker_id);
+  explicit WorkerDevToolsAgentHost(WorkerId worker_id);
   ~WorkerDevToolsAgentHost() override;
 
   enum WorkerState {

content/browser/geofencing/mock_geofencing_service.h

@@ -20,7 +20,7 @@ namespace content {
 // will behave as if the platform does not support geofencing.
 class MockGeofencingService : public GeofencingService {
  public:
-  MockGeofencingService(bool service_available);
+  explicit MockGeofencingService(bool service_available);
   ~MockGeofencingService() override;
 
   void SetMockPosition(double latitude, double longitude);

content/browser/renderer_host/input/synthetic_smooth_move_gesture.h

@@ -45,7 +45,7 @@ class CONTENT_EXPORT SyntheticSmoothMoveGestureParams {
 // to compensate for the touch slop.
 class CONTENT_EXPORT SyntheticSmoothMoveGesture : public SyntheticGesture {
  public:
-  SyntheticSmoothMoveGesture(SyntheticSmoothMoveGestureParams params);
+  explicit SyntheticSmoothMoveGesture(SyntheticSmoothMoveGestureParams params);
   ~SyntheticSmoothMoveGesture() override;
 
   // SyntheticGesture implementation:

content/browser/renderer_host/legacy_render_widget_host_win.h

@@ -110,7 +110,7 @@ class CONTENT_EXPORT LegacyRenderWidgetHostHWND
   void OnFinalMessage(HWND hwnd) override;
 
  private:
-  LegacyRenderWidgetHostHWND(HWND parent);
+  explicit LegacyRenderWidgetHostHWND(HWND parent);
   ~LegacyRenderWidgetHostHWND() override;
 
   bool Init();

content/browser/renderer_host/media/peer_connection_tracker_host.h

@@ -23,7 +23,7 @@ namespace content {
 class PeerConnectionTrackerHost : public BrowserMessageFilter,
                                   public base::PowerObserver {
  public:
-  PeerConnectionTrackerHost(int render_process_id);
+  explicit PeerConnectionTrackerHost(int render_process_id);
 
   // content::BrowserMessageFilter override.
   bool OnMessageReceived(const IPC::Message& message) override;

content/common/gpu/media/vt_video_decode_accelerator.h

@@ -85,7 +85,7 @@ class VTVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
   };
 
   struct Frame {
-    Frame(int32_t bitstream_id);
+    explicit Frame(int32_t bitstream_id);
     ~Frame();
 
     // ID of the bitstream buffer this Frame will be decoded from.

content/public/browser/background_tracing_config.h

@@ -36,7 +36,7 @@ struct CONTENT_EXPORT BackgroundTracingConfig {
                        base::DictionaryValue* dict);
 
  protected:
-  BackgroundTracingConfig(Mode mode);
+  explicit BackgroundTracingConfig(Mode mode);
 };
 
 }  // namespace content

device/bluetooth/bluetooth_advertisement.h

@@ -53,7 +53,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdvertisement
   // Structure that holds the data for an advertisement.
   class DEVICE_BLUETOOTH_EXPORT Data {
    public:
-    Data(AdvertisementType type);
+    explicit Data(AdvertisementType type);
     ~Data();
 
     AdvertisementType type() { return type_; }

native_client_sdk/src/libraries/nacl_io/pipe/pipe_event_emitter.h

@@ -22,7 +22,7 @@ typedef sdk_util::ScopedRef<PipeEventEmitter> ScopedPipeEventEmitter;
 
 class PipeEventEmitter : public StreamEventEmitter {
  public:
-  PipeEventEmitter(size_t size);
+  explicit PipeEventEmitter(size_t size);
 
   Error Read_Locked(char* data, size_t len, int* out_bytes);
   Error Write_Locked(const char* data, size_t len, int* out_bytes);

net/base/chunked_upload_data_stream.h

@@ -23,7 +23,7 @@ class IOBuffer;
 // seekable data, due to this buffering behavior.
 class NET_EXPORT ChunkedUploadDataStream : public UploadDataStream {
  public:
-  ChunkedUploadDataStream(int64 identifier);
+  explicit ChunkedUploadDataStream(int64 identifier);
 
   ~ChunkedUploadDataStream() override;
 

net/base/upload_file_element_reader.h

@@ -71,7 +71,7 @@ class NET_EXPORT UploadFileElementReader : public UploadElementReader {
   // Sets an value to override the result for GetContentLength().
   // Used for tests.
   struct NET_EXPORT_PRIVATE ScopedOverridingContentLengthForTests {
-    ScopedOverridingContentLengthForTests(uint64 value);
+    explicit ScopedOverridingContentLengthForTests(uint64 value);
     ~ScopedOverridingContentLengthForTests();
   };
 

net/filter/gzip_filter.h

@@ -73,7 +73,7 @@ class GZipFilter : public Filter {
   static const int kGZipFooterSize = 8;
 
   // Only to be instantiated by Filter::Factory.
-  GZipFilter(FilterType type);
+  explicit GZipFilter(FilterType type);
   friend class Filter;
 
   // Parses and verifies the GZip header.

ppapi/cpp/view.h

@@ -24,7 +24,7 @@ class View : public Resource {
 
   /// Creates a View resource, taking and holding an additional reference to
   /// the given resource handle.
-  View(PP_Resource view_resource);
+  explicit View(PP_Resource view_resource);
 
   /// GetRect() retrieves the rectangle of the module instance associated
   /// with a view changed notification relative to the upper-left of the browser

remoting/host/audio_silence_detector.h

@@ -15,7 +15,7 @@ class AudioSilenceDetector {
  public:
   // |threshold| is used to specify maximum absolute sample value that should
   // still be considered as silence.
-  AudioSilenceDetector(int threshold);
+  explicit AudioSilenceDetector(int threshold);
   ~AudioSilenceDetector();
 
   void Reset(int sampling_rate, int channels);

ui/ozone/common/display_util.h

@@ -22,7 +22,7 @@ class DisplaySnapshot;
 // find a display with |display_id| in std:: containers (ie: std::vector).
 class FindDisplayById {
  public:
-  FindDisplayById(int64_t display_id);
+  explicit FindDisplayById(int64_t display_id);
 
   bool operator()(const DisplaySnapshot_Params& display) const;