[DevTools] migrate InspectorPageAgent and InspectorMemoryAgent to new style

third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.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 18 matching lines @@
  */
 
 #include "core/inspector/InspectorMemoryAgent.h"
 
 #include "platform/InstanceCounters.h"
 
 namespace blink {
 
 InspectorMemoryAgent::~InspectorMemoryAgent() {}
 
-void InspectorMemoryAgent::getDOMCounters(ErrorString*,
-                                          int* documents,
-                                          int* nodes,
-                                          int* jsEventListeners) {
+Response InspectorMemoryAgent::getDOMCounters(int* documents,
+                                              int* nodes,
+                                              int* jsEventListeners) {
   *documents =
       InstanceCounters::counterValue(InstanceCounters::DocumentCounter);
   *nodes = InstanceCounters::counterValue(InstanceCounters::NodeCounter);
   *jsEventListeners =
       InstanceCounters::counterValue(InstanceCounters::JSEventListenerCounter);
+  return Response::OK();
 }
 
 InspectorMemoryAgent::InspectorMemoryAgent() = default;
 
 }  // namespace blink