Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorTimelineAgent.h

 /*
 * Copyright (C) 2012 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 43 matching lines @@
 struct TimelineRecordEntry;
 struct TimelineThreadState;
 
 class LocalDOMWindow;
 class Document;
 class DocumentLoader;
 class Event;
 class ExecutionContext;
 class FloatQuad;
 class LocalFrame;
-class FrameHost;
 class GraphicsContext;
 class GraphicsLayer;
 class InspectorClient;
 class InspectorFrontend;
 class InspectorOverlay;
 class InspectorPageAgent;
 class InspectorLayerTreeAgent;
-class InstrumentingAgents;
 class KURL;
 class ScriptState;
 class Node;
 class RenderImage;
 class RenderObject;
 class ResourceError;
 class ResourceLoader;
 class ResourceRequest;
 class ResourceResponse;
-class ScriptArguments;
-class ScriptCallStack;
 class TimelineRecordStack;
 class WebSocketHandshakeRequest;
 class WebSocketHandshakeResponse;
 class XMLHttpRequest;
 
 typedef String ErrorString;
 
 class InspectorTimelineAgent final
     : public InspectorBaseAgent<InspectorTimelineAgent>
     , public ScriptGCEventListener
@@ skipping 222 matching lines @@
     typedef WillBeHeapHashMap<ThreadIdentifier, TimelineThreadState> ThreadStateMap;
     ThreadStateMap m_threadStates;
     bool m_mayEmitFirstPaint;
     HashSet<String> m_liveEvents;
     double m_lastProgressTimestamp;
 };
 
 } // namespace blink
 
 #endif // !defined(InspectorTimelineAgent_h)