Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorRuntimeAgent.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 22 matching lines @@
 
 #include "core/InspectorFrontend.h"
 #include "core/inspector/InspectorBaseAgent.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class InjectedScript;
 class InjectedScriptManager;
-class InstrumentingAgents;
 class JSONArray;
 class ScriptState;
 class ScriptDebugServer;
 
 typedef String ErrorString;
 
 class InspectorRuntimeAgent : public InspectorBaseAgent<InspectorRuntimeAgent>, public InspectorBackendDispatcher::RuntimeCommandHandler {
     WTF_MAKE_NONCOPYABLE(InspectorRuntimeAgent);
 public:
     virtual ~InspectorRuntimeAgent();
@@ skipping 49 matching lines @@
     ScriptStateToId m_scriptStateToId;
 
 private:
     RawPtrWillBeMember<InjectedScriptManager> m_injectedScriptManager;
     ScriptDebugServer* m_scriptDebugServer;
 };
 
 } // namespace blink
 
 #endif // InspectorRuntimeAgent_h