Fix virtual/override/final usage in the rest of Source/core/.

Source/core/inspector/InspectorPageAgent.cpp

 /*
  * 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 99 matching lines @@
     }
     return TypeBuilder::Page::DialogType::Alert;
 }
 
 }
 
 class InspectorPageAgent::GetResourceContentLoadListener final : public VoidCallback {
 public:
     GetResourceContentLoadListener(InspectorPageAgent*, const String& frameId, const String& url, PassRefPtrWillBeRawPtr<GetResourceContentCallback>);
     DECLARE_VIRTUAL_TRACE();
-    virtual void handleEvent() override;
+    void handleEvent() override;
 private:
     RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     String m_frameId;
     String m_url;
     RefPtrWillBeMember<GetResourceContentCallback> m_callback;
 };
 
 InspectorPageAgent::GetResourceContentLoadListener::GetResourceContentLoadListener(InspectorPageAgent* pageAgent, const String& frameId, const String& url, PassRefPtrWillBeRawPtr<GetResourceContentCallback> callback)
     : m_pageAgent(pageAgent)
     , m_frameId(frameId)
@@ skipping 737 matching lines @@
 {
     visitor->trace(m_inspectedFrame);
     visitor->trace(m_debuggerAgent);
     visitor->trace(m_cssAgent);
     visitor->trace(m_overlay);
     visitor->trace(m_inspectorResourceContentLoader);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink