cc: Remove the capability to give up and leave compositing mode.

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 17dacc82b8e6cfa488bbf04261f71807956a0051..90bcc250c7fc2ccc8992840d01a8fc8150eaa2dc 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -114,13 +114,7 @@ class CC_EXPORT LayerTreeHost {
       LayerTreeHostImplClient* client);
   void DidLoseOutputSurface();
   bool output_surface_lost() const { return output_surface_lost_; }
-  enum CreateResult {
-    CreateSucceeded,
-    CreateFailedButTryAgain,
-    CreateFailedAndGaveUp,
-  };
-  virtual CreateResult OnCreateAndInitializeOutputSurfaceAttempted(
-      bool success);
+  virtual void OnCreateAndInitializeOutputSurfaceAttempted(bool success);
   void DidCommitAndDrawFrame() { client_->DidCommitAndDrawFrame(); }
   void DidCompleteSwapBuffers() { client_->DidCompleteSwapBuffers(); }
   void DeleteContentsTexturesOnImplThread(ResourceProvider* resource_provider);