[ Service ] Remove dead code

TEST=CQ

CoreLibraryReviewExempt: VM service only change
Change-Id: I7518c8eefb98c80f1748897834d99457a6083929
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/383001
Commit-Queue: Ben Konyi <bkonyi@google.com>
Reviewed-by: Derek Xu <derekx@google.com>
Auto-Submit: Ben Konyi <bkonyi@google.com>

sdk/lib/vmservice/vmservice.dart

@@ -5,7 +5,6 @@
 library dart._vmservice;
 
 import 'dart:async';
-import 'dart:collection';
 import 'dart:convert';
 import 'dart:isolate';
 import 'dart:math';
@@ -22,11 +21,6 @@ part 'message_router.dart';
 part 'named_lookup.dart';
 
 final isolateControlPort = RawReceivePort(null, 'Isolate Control Port');
-final scriptLoadPort = RawReceivePort(null, 'Script Load');
-
-abstract class IsolateEmbedderData {
-  void cleanup();
-}
 
 String _makeAuthToken() {
   final kTokenByteSize = 8;
@@ -41,11 +35,6 @@ String _makeAuthToken() {
 // The randomly generated auth token used to access the VM service.
 final serviceAuthToken = _makeAuthToken();
 
-// This is for use by the embedder. It is a map from the isolateId to
-// anything implementing IsolateEmbedderData. When an isolate goes away,
-// the cleanup method will be invoked after being removed from the map.
-final isolateEmbedderData = <int, IsolateEmbedderData>{};
-
 // These must be kept in sync with the declarations in vm/json_stream.h and
 // pkg/dds/lib/src/rpc_error_codes.dart.
 const kParseError = -32700;
@@ -139,12 +128,6 @@ String encodeSuccess(Message message) =>
 
 const shortDelay = Duration(milliseconds: 10);
 
-/// Called when the server should be started.
-typedef Future<void> ServerStartCallback();
-
-/// Called when the server should be stopped.
-typedef Future<void> ServerStopCallback();
-
 /// Called when DDS has connected.
 typedef Future<void> DdsConnectedCallback();
 
@@ -191,8 +174,6 @@ typedef void ServeObservatoryCallback();
 
 /// Hooks that are setup by the embedder.
 class VMServiceEmbedderHooks {
-  static ServerStartCallback? serverStart;
-  static ServerStopCallback? serverStop;
   static DdsConnectedCallback? ddsConnected;
   static DdsDisconnectedCallback? ddsDisconnected;
   static CleanupCallback? cleanup;
@@ -209,11 +190,6 @@ class VMServiceEmbedderHooks {
   static ServeObservatoryCallback? serveObservatory;
 }
 
-class _ClientResumePermissions {
-  final List<Client> clients = [];
-  int permissionsMask = 0;
-}
-
 class VMService extends MessageRouter {
   static VMService? _instance;
 
@@ -223,10 +199,6 @@ class VMService extends MessageRouter {
   final clients = NamedLookup<Client>(prologue: serviceNamespace);
   final _serviceRequests = IdGenerator(prologue: 'sr');
 
-  /// Mapping of client names to all clients of that name and their resume
-  /// permissions.
-  final Map<String, _ClientResumePermissions> clientResumePermissions = {};
-
   /// Collection of currently running isolates.
   final runningIsolates = RunningIsolates();
 
@@ -393,7 +365,6 @@ class VMService extends MessageRouter {
         break;
       case Constants.ISOLATE_SHUTDOWN_MESSAGE_ID:
         runningIsolates.isolateShutdown(portId, sp);
-        isolateEmbedderData.remove(portId)?.cleanup();
         break;
     }
   }
@@ -467,19 +438,9 @@ class VMService extends MessageRouter {
   Future<void> _exit() async {
     isExiting = true;
 
-    final serverStop = VMServiceEmbedderHooks.serverStop;
-    // Stop the server.
-    if (serverStop != null) {
-      await serverStop();
-    }
-
     // Close receive ports.
     isolateControlPort.close();
-    scriptLoadPort.close();
-    final cleanup = VMServiceEmbedderHooks.cleanup;
-    if (cleanup != null) {
-      await cleanup();
-    }
+    await VMServiceEmbedderHooks.cleanup!();
     await clearState();
     // Notify the VM that we have exited.
     _onExit();