cc: Clean up LayerTreeTest and TestHooks.

cc/trees/threaded_channel.h

Index: cc/trees/threaded_channel.h
diff --git a/cc/trees/threaded_channel.h b/cc/trees/threaded_channel.h
index ffbbcc9f2ebc2d124c51d409d72647179cdc2d4f..1ae1ef1d19019df0d1faf5ee94ee313bab0ef254 100644
--- a/cc/trees/threaded_channel.h
+++ b/cc/trees/threaded_channel.h
@@ -106,10 +106,10 @@ class CC_EXPORT ThreadedChannel : public ChannelMain, public ChannelImpl {
   void MainFrameWillHappenOnImplForTesting(
       CompletionEvent* completion,
       bool* main_frame_will_happen) override;
-  void StartCommitOnImpl(CompletionEvent* completion,
-                         LayerTreeHost* layer_tree_host,
-                         base::TimeTicks main_thread_start_time,
-                         bool hold_commit_for_activation) override;
+  void NotifyReadyToCommitOnImpl(CompletionEvent* completion,
+                                 LayerTreeHost* layer_tree_host,
+                                 base::TimeTicks main_thread_start_time,
+                                 bool hold_commit_for_activation) override;
   void SynchronouslyInitializeImpl(
       LayerTreeHost* layer_tree_host,
       std::unique_ptr<BeginFrameSource> external_begin_frame_source) override;