Ignore DevTools messages from the old inspected RVH after navigation

content/renderer/devtools/devtools_client.cc

 // Copyright (c) 2012 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/renderer/devtools/devtools_client.h"
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/devtools_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebDevToolsFrontend.h"
 #include "ui/base/ui_base_switches.h"
 
 using blink::WebDevToolsFrontend;
 using blink::WebString;
 
 namespace content {
 
-DevToolsClient::DevToolsClient(RenderViewImpl* render_view)
-    : RenderViewObserver(render_view) {
+DevToolsClient::DevToolsClient(RenderFrame* main_render_frame)
+    : RenderFrameObserver(main_render_frame) {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
-  web_tools_frontend_.reset(
-      WebDevToolsFrontend::create(
-          render_view->webview(),
-          this,
-          base::ASCIIToUTF16(
-              command_line.GetSwitchValueASCII(switches::kLang))));
+  web_tools_frontend_.reset(WebDevToolsFrontend::create(
+      main_render_frame->GetRenderView()->GetWebView(), this,
+      base::ASCIIToUTF16(command_line.GetSwitchValueASCII(switches::kLang))));
 }
 
 DevToolsClient::~DevToolsClient() {
 }
 
 void DevToolsClient::sendMessageToBackend(const WebString& message)  {
   Send(new DevToolsAgentMsg_DispatchOnInspectorBackend(routing_id(),
                                                        message.utf8()));
 }
 
 void DevToolsClient::sendMessageToEmbedder(const WebString& message) {
   Send(new DevToolsHostMsg_DispatchOnEmbedder(routing_id(),
                                               message.utf8()));
 }
 
 bool DevToolsClient::isUnderTest() {
   return RenderThreadImpl::current()->layout_test_mode();
 }
 
 }  // namespace content