Ignore DevTools messages from the old inspected RVH after navigation

content/renderer/devtools/devtools_client.cc

Index: content/renderer/devtools/devtools_client.cc
diff --git a/content/renderer/devtools/devtools_client.cc b/content/renderer/devtools/devtools_client.cc
index 0d4f7dc520b732c90dda98535adcddfdfe8c2a32..903d3a868e92b3e62a01f96d12788819a6d7ca44 100644
--- a/content/renderer/devtools/devtools_client.cc
+++ b/content/renderer/devtools/devtools_client.cc
@@ -22,15 +22,12 @@ 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() {