Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorInstrumentation.h

 /*
 * Copyright (C) 2010 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 33 matching lines @@
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderImage.h"
 #include "core/storage/StorageArea.h"
 #include "platform/network/FormData.h"
 #include "platform/network/WebSocketHandshakeRequest.h"
 #include "platform/network/WebSocketHandshakeResponse.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
-struct CSSParserString;
 class Document;
-class Element;
 class EventTarget;
 class ExecutionContext;
-class GraphicsContext;
-class GraphicsLayer;
 class InspectorTimelineAgent;
 class InstrumentingAgents;
-class RenderLayer;
 class ThreadableLoaderClient;
 class WorkerGlobalScope;
 class WorkerInspectorProxy;
 
 #define FAST_RETURN_IF_NO_FRONTENDS(value) if (!hasFrontends()) return value;
 
 class InspectorInstrumentationCookie {
 public:
     InspectorInstrumentationCookie();
     InspectorInstrumentationCookie(InstrumentingAgents*, int);
@@ skipping 115 matching lines @@
 
 } // namespace blink
 
 #include "core/InspectorInstrumentationInl.h"
 
 #include "core/inspector/InspectorInstrumentationCustomInl.h"
 
 #include "core/InspectorOverridesInl.h"
 
 #endif // !defined(InspectorInstrumentation_h)