Clean up forward declarations in Source/core/inspector

Source/core/inspector/InspectorDOMDebuggerAgent.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 30 matching lines @@
 
 namespace blink {
 
 class Document;
 class Element;
 class Event;
 class EventListener;
 class EventTarget;
 class InspectorDOMAgent;
 class InspectorDebuggerAgent;
-class InspectorFrontend;
-class InstrumentingAgents;
 class JSONObject;
 class Node;
 
 typedef String ErrorString;
 
 class InspectorDOMDebuggerAgent final
     : public InspectorBaseAgent<InspectorDOMDebuggerAgent>
     , public InspectorDebuggerAgent::Listener
     , public InspectorDOMAgent::Listener
     , public InspectorBackendDispatcher::DOMDebuggerCommandHandler {
@@ skipping 72 matching lines @@
     RawPtrWillBeMember<InspectorDOMAgent> m_domAgent;
     RawPtrWillBeMember<InspectorDebuggerAgent> m_debuggerAgent;
     WillBeHeapHashMap<RawPtrWillBeMember<Node>, uint32_t> m_domBreakpoints;
     bool m_pauseInNextEventListener;
 };
 
 } // namespace blink
 
 
 #endif // !defined(InspectorDOMDebuggerAgent_h)