[DevTools] Merge InspectorFrontendClientImpl into WebDevToolsFrontendImpl and remove unused code.

Source/core/inspector/InspectorFrontendClient.h

 /*
  * Copyright (C) 2010 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef InspectorFrontendClient_h
 #define InspectorFrontendClient_h
 
-#include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
-class InspectorFrontendClient : public NoBaseWillBeGarbageCollectedFinalized<InspectorFrontendClient> {
+class InspectorFrontendClient {
 public:
     virtual ~InspectorFrontendClient() { }
 
-    virtual void trace(Visitor*) { }
-
     virtual void windowObjectCleared() = 0;
 
     virtual void sendMessageToBackend(const String&) = 0;
 
     virtual void sendMessageToEmbedder(const String&) = 0;
 
     virtual bool isUnderTest() = 0;
 
     virtual void dispose() = 0;
 };
 
 } // namespace blink
 
 #endif