Switch DomAutomationController to be a RenderFrameObserver.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 63aebf9cd1c2cf8540e9b5d6db3bc8fc4ec3b972..15b02c4114beab49bdbd4224f2795b76e77b6e44 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -442,6 +442,8 @@ bool WebContentsImpl::OnMessageReceived(RenderViewHost* render_view_host,
   IPC_BEGIN_MESSAGE_MAP_EX(WebContentsImpl, message, message_is_ok)
     IPC_MESSAGE_HANDLER(FrameHostMsg_PepperPluginHung, OnPepperPluginHung)
     IPC_MESSAGE_HANDLER(FrameHostMsg_PluginCrashed, OnPluginCrashed)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_DomOperationResponse,
+                        OnDomOperationResponse)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidLoadResourceFromMemoryCache,
                         OnDidLoadResourceFromMemoryCache)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidDisplayInsecureContent,
@@ -2389,6 +2391,15 @@ void WebContentsImpl::OnPluginCrashed(const base::FilePath& plugin_path,
                     PluginCrashed(plugin_path, plugin_pid));
 }
 
+void WebContentsImpl::OnDomOperationResponse(const std::string& json_string,
+                                             int automation_id) {
+  DomOperationNotificationDetails details(json_string, automation_id);
+  NotificationService::current()->Notify(
+      NOTIFICATION_DOM_OPERATION_RESPONSE,
+      Source<WebContents>(this),
+      Details<DomOperationNotificationDetails>(&details));
+}
+
 void WebContentsImpl::OnAppCacheAccessed(const GURL& manifest_url,
                                          bool blocked_by_policy) {
   // Notify observers about navigation.