Switch DomAutomationController to be a RenderFrameObserver.

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index 067bf38082f24f6efb7f10dff8bd7708170a810d..31eb6d6625e20da48209c9e9aa56b70e813a8e5b 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -18,6 +18,7 @@
 #include "content/public/browser/dom_operation_notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
+#include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
@@ -44,7 +45,7 @@ class DOMOperationObserver : public NotificationObserver,
       : WebContentsObserver(WebContents::FromRenderViewHost(rvh)),
         did_respond_(false) {
     registrar_.Add(this, NOTIFICATION_DOM_OPERATION_RESPONSE,
-                   Source<RenderViewHost>(rvh));
+                   Source<WebContents>(web_contents()));
     message_loop_runner_ = new MessageLoopRunner;
   }