[DevTools] migrate InspectorPageAgent and InspectorMemoryAgent to new style

third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.cpp
index a77a2d7aca4331efcc4e79fa8da27348218a4299..4b9d75553f5ee6f664e261e312519b3f9cf317e0 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorMemoryAgent.cpp
@@ -36,15 +36,15 @@ 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;