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 15b71dd3b982e26e4fdec5d1b4f79efe1a6fa717..32ddba001af858f39e2a38aae68cf645f4cde5c1 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4745,21 +4745,6 @@ void RenderFrameImpl::ExitFullscreen() {
   Send(new FrameHostMsg_ToggleFullscreen(routing_id_, false));
 }
 
-void RenderFrameImpl::SuddenTerminationDisablerChanged(
-    bool present,
-    blink::WebFrameClient::SuddenTerminationDisablerType type) {
-  switch (type) {
-    case blink::WebFrameClient::kBeforeUnloadHandler:
-      Send(new FrameHostMsg_BeforeUnloadHandlersPresent(routing_id_, present));
-      break;
-    case blink::WebFrameClient::kUnloadHandler:
-      Send(new FrameHostMsg_UnloadHandlersPresent(routing_id_, present));
-      break;
-    default:
-      NOTREACHED();
-  }
-}
-
 void RenderFrameImpl::RegisterProtocolHandler(const WebString& scheme,
                                               const WebURL& url,
                                               const WebString& title) {