Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorApplicationCacheAgent.h

 /*
  * Copyright (C) 2010 Apple 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/inspector/InspectorBaseAgent.h"
 #include "core/loader/appcache/ApplicationCacheHost.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class LocalFrame;
 class InspectorFrontend;
 class InspectorPageAgent;
-class InstrumentingAgents;
 
 typedef String ErrorString;
 
 class InspectorApplicationCacheAgent final : public InspectorBaseAgent<InspectorApplicationCacheAgent>, public InspectorBackendDispatcher::ApplicationCacheCommandHandler {
     WTF_MAKE_NONCOPYABLE(InspectorApplicationCacheAgent);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     static PassOwnPtrWillBeRawPtr<InspectorApplicationCacheAgent> create(InspectorPageAgent* pageAgent)
     {
         return adoptPtrWillBeNoop(new InspectorApplicationCacheAgent(pageAgent));
@@ skipping 24 matching lines @@
 
     DocumentLoader* assertFrameWithDocumentLoader(ErrorString*, String frameId);
 
     RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     InspectorFrontend::ApplicationCache* m_frontend;
 };
 
 } // namespace blink
 
 #endif // InspectorApplicationCacheAgent_h