[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/memory_handler.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/devtools/protocol/memory_handler.h"
 
 #include "base/memory/memory_pressure_listener.h"
 #include "base/strings/stringprintf.h"
 #include "content/browser/memory/memory_pressure_controller_impl.h"
 #include "content/public/common/content_features.h"
 
 namespace content {
 namespace protocol {
 
-MemoryHandler::MemoryHandler() {}
+MemoryHandler::MemoryHandler()
+    : DevToolsDomainHandler(Memory::Metainfo::domainName) {
+}
 
 MemoryHandler::~MemoryHandler() {}
 
 void MemoryHandler::Wire(UberDispatcher* dispatcher) {
   Memory::Dispatcher::wire(dispatcher, this);
 }
 
+void MemoryHandler::SetRenderFrameHost(RenderFrameHostImpl* host) {
+}
+
 Response MemoryHandler::Disable() {
   return Response::OK();
 }
 
 Response MemoryHandler::SetPressureNotificationsSuppressed(
     bool suppressed) {
   if (base::FeatureList::IsEnabled(features::kMemoryCoordinator)) {
     return Response::Error(
         "Cannot enable/disable notifications when memory coordinator is "
         "enabled");
@@ skipping 15 matching lines @@
         "Invalid memory pressure level '%s'", level.c_str()));
   }
 
   MemoryPressureControllerImpl::GetInstance()
       ->SimulatePressureNotificationInAllProcesses(parsed_level);
   return Response::OK();
 }
 
 }  // namespace protocol
 }  // namespace content