Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorDebuggerAgent.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010-2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 40 matching lines @@
 class ConsoleMessage;
 class Document;
 class Event;
 class EventListener;
 class EventTarget;
 class ExecutionContextTask;
 class FormData;
 class HTTPHeaderMap;
 class InjectedScriptManager;
 class InspectorFrontend;
-class InstrumentingAgents;
 class JavaScriptCallFrame;
 class JSONObject;
 class KURL;
 class MutationObserver;
-class ScriptArguments;
 class ScriptAsyncCallStack;
-class ScriptCallStack;
 class ScriptDebugServer;
 class ScriptRegexp;
 class ScriptSourceCode;
 class ScriptValue;
 class ThreadableLoaderClient;
 class XMLHttpRequest;
 
 typedef String ErrorString;
 
 class InspectorDebuggerAgent : public InspectorBaseAgent<InspectorDebuggerAgent>, public ScriptDebugListener, public InspectorBackendDispatcher::DebuggerCommandHandler {
@@ skipping 200 matching lines @@
     bool m_skipContentScripts;
     OwnPtr<ScriptRegexp> m_cachedSkipStackRegExp;
     OwnPtrWillBeMember<AsyncCallStackTracker> m_asyncCallStackTracker;
     OwnPtrWillBeMember<PromiseTracker> m_promiseTracker;
 };
 
 } // namespace blink
 
 
 #endif // !defined(InspectorDebuggerAgent_h)