[DevTools] migrate InspectorPageAgent and InspectorMemoryAgent to new style

third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.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 27 matching lines @@
 namespace blink {
 
 class CORE_EXPORT InspectorMemoryAgent final
     : public InspectorBaseAgent<protocol::Memory::Metainfo> {
   WTF_MAKE_NONCOPYABLE(InspectorMemoryAgent);
 
  public:
   static InspectorMemoryAgent* create() { return new InspectorMemoryAgent(); }
   ~InspectorMemoryAgent() override;
 
-  void getDOMCounters(ErrorString*,
-                      int* documents,
-                      int* nodes,
-                      int* jsEventListeners) override;
+  Response getDOMCounters(int* documents,
+                          int* nodes,
+                          int* jsEventListeners) override;
 
  private:
   InspectorMemoryAgent();
 };
 
 }  // namespace blink
 
 #endif  // !defined(InspectorMemoryAgent_h)