Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorTraceEvents.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InspectorTraceEvents_h
 #define InspectorTraceEvents_h
 
 #include "platform/EventTracer.h"
 #include "platform/TraceEvent.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class Document;
 class Event;
 class ExecutionContext;
 class FrameView;
-class GraphicsContext;
 class GraphicsLayer;
 class KURL;
 class LayoutRect;
 class LocalFrame;
 class Node;
 class RenderImage;
 class RenderLayer;
 class RenderObject;
 class ResourceRequest;
 class ResourceResponse;
-class ScriptCallStack;
-class ScriptSourceCode;
 class StyleChangeReasonForTracing;
 class WorkerThread;
 class XMLHttpRequest;
 
 class InspectorLayoutEvent {
 public:
     static PassRefPtr<TraceEvent::ConvertableToTraceFormat> beginData(FrameView*);
     static PassRefPtr<TraceEvent::ConvertableToTraceFormat> endData(RenderObject* rootForThisLayout);
 };
 
@@ skipping 147 matching lines @@
 
 class InspectorTracingSessionIdForWorkerEvent {
 public:
     static PassRefPtr<TraceEvent::ConvertableToTraceFormat> data(const String& sessionId, WorkerThread*);
 };
 
 } // namespace blink
 
 
 #endif // !defined(InspectorTraceEvents_h)