Revert of Keep track in the browser of which frames have onunload and onbeforeunload handlers.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 421ae065cfbcd6d2d3f951423709ef3852372ac9..679773f82aca83ced3397903a82c2e4dd7c899e6 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4756,21 +4756,6 @@
   Send(new FrameHostMsg_ToggleFullscreen(routing_id_, false));
 }
 
-void RenderFrameImpl::suddenTerminationDisablerChanged(
-    bool present,
-    blink::WebFrameClient::SuddenTerminationDisablerType type) {
-  switch (type) {
-    case blink::WebFrameClient::BeforeUnloadHandler:
-      Send(new FrameHostMsg_BeforeUnloadHandlersPresent(routing_id_, present));
-      break;
-    case blink::WebFrameClient::UnloadHandler:
-      Send(new FrameHostMsg_UnloadHandlersPresent(routing_id_, present));
-      break;
-    default:
-      NOTREACHED();
-  }
-}
-
 void RenderFrameImpl::registerProtocolHandler(const WebString& scheme,
                                               const WebURL& url,
                                               const WebString& title) {