Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorWorkerAgent.h

 /*
  * Copyright (C) 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:
  *
  *     * 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 19 matching lines @@
 
 #ifndef InspectorWorkerAgent_h
 #define InspectorWorkerAgent_h
 
 #include "core/InspectorFrontend.h"
 #include "core/inspector/InspectorBaseAgent.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
-class InstrumentingAgents;
 class JSONObject;
 class KURL;
 class WorkerInspectorProxy;
 
 typedef String ErrorString;
 
 class InspectorWorkerAgent final : public InspectorBaseAgent<InspectorWorkerAgent>, public InspectorBackendDispatcher::WorkerCommandHandler {
 public:
     static PassOwnPtrWillBeRawPtr<InspectorWorkerAgent> create();
     virtual ~InspectorWorkerAgent();
@@ skipping 31 matching lines @@
     typedef HashMap<int, WorkerFrontendChannel*> WorkerChannels;
     WorkerChannels m_idToChannel;
     typedef HashMap<WorkerInspectorProxy*, String> WorkerIds;
     WorkerIds m_workerIds;
     String m_tracingSessionId;
 };
 
 } // namespace blink
 
 #endif // !defined(InspectorWorkerAgent_h)