Remove ViewHostMsg_UpdateIsDelayed

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index e686ce842e051a3d84e2e82f2b1252a48de978ff..a47d71aa9ce8d41184545f82b4fa011d800b2864 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -435,7 +435,6 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message,
 #endif
     IPC_MESSAGE_HANDLER_GENERIC(ViewHostMsg_UpdateRect,
         render_widget_helper_->DidReceiveBackingStoreMsg(message))
-    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateIsDelayed, OnUpdateIsDelayed)
     IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_CheckPermission,
                         OnCheckNotificationPermission)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SyncAllocateSharedMemory,
@@ -1138,19 +1137,6 @@ void RenderMessageFilter::OnCompletedOpenChannelToNpapiPlugin(
   plugin_host_clients_.erase(client);
 }
 
-void RenderMessageFilter::OnUpdateIsDelayed(const IPC::Message& msg) {
-  // When not in accelerated compositing mode, in certain cases (e.g. waiting
-  // for a resize or if no backing store) the RenderWidgetHost is blocking the
-  // UI thread for some time, waiting for an UpdateRect from the renderer. If we
-  // are going to switch to accelerated compositing, the GPU process may need
-  // round-trips to the UI thread before finishing the frame, causing deadlocks
-  // if we delay the UpdateRect until we receive the OnSwapBuffersComplete. So
-  // the renderer sent us this message, so that we can unblock the UI thread.
-  // We will simply re-use the UpdateRect unblock mechanism, just with a
-  // different message.
-  render_widget_helper_->DidReceiveBackingStoreMsg(msg);
-}
-
 void RenderMessageFilter::OnAre3DAPIsBlocked(int render_view_id,
                                              const GURL& top_origin_url,
                                              ThreeDAPIType requester,