Add // nogncheck for broker_service.h in //chromecast/browser

Add // nongncheck for broker_service.h for a few files in
//chromecast/browser, otherwise the gn check will fail for gn
check on missing the gn target broker_service, even though it
is included already by arg  and buildflag
ENABLE_EXTERNAL_MOJO_SERVICES.

Bug: 169104485
Test: CQ
Change-Id: Iffe34806ed2e51fdb91216425a6133d0d5ba826b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533735
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Zhaoxin Liang <zxliang@google.com>
Cr-Commit-Position: refs/heads/master@{#826964}

chromecast/browser/cast_content_browser_client.cc

@@ -127,7 +127,7 @@
 #endif
 
 #if BUILDFLAG(ENABLE_EXTERNAL_MOJO_SERVICES)
-#include "chromecast/external_mojo/broker_service/broker_service.h"
+#include "chromecast/external_mojo/broker_service/broker_service.h"  // nogncheck
 #endif
 
 #if (defined(OS_LINUX) || defined(OS_CHROMEOS)) && defined(USE_OZONE)

chromecast/browser/cast_content_browser_client_receiver_bindings.cc

@@ -36,7 +36,7 @@
 #endif  // BUILDFLAG(ENABLE_CAST_RENDERER)
 
 #if BUILDFLAG(ENABLE_EXTERNAL_MOJO_SERVICES)
-#include "chromecast/external_mojo/broker_service/broker_service.h"
+#include "chromecast/external_mojo/broker_service/broker_service.h"  // nogncheck
 #endif
 
 #if (defined(OS_LINUX) || defined(OS_CHROMEOS)) && defined(USE_OZONE)

chromecast/browser/cast_overlay_manifests.cc

@@ -13,7 +13,7 @@
 #include "services/service_manager/public/cpp/manifest_builder.h"
 
 #if BUILDFLAG(ENABLE_EXTERNAL_MOJO_SERVICES)
-#include "chromecast/external_mojo/broker_service/broker_service.h"
+#include "chromecast/external_mojo/broker_service/broker_service.h"  // nogncheck
 #endif
 
 #if defined(USE_INTERNAL_OVERLAY_MANIFESTS)