cc: Clean up LayerTreeTest and TestHooks.

cc/trees/proxy_main.cc

Index: cc/trees/proxy_main.cc
diff --git a/cc/trees/proxy_main.cc b/cc/trees/proxy_main.cc
index 7107d11a3fc95f84d19135438d2a0b1adb3417b3..6e1de7fc97d9c63c8069e09d2304ad4c4584c27b 100644
--- a/cc/trees/proxy_main.cc
+++ b/cc/trees/proxy_main.cc
@@ -245,9 +245,9 @@ void ProxyMain::BeginMainFrame(
     bool hold_commit_for_activation = commit_waits_for_activation_;
     commit_waits_for_activation_ = false;
     CompletionEvent completion;
-    channel_main_->StartCommitOnImpl(&completion, layer_tree_host_,
-                                     begin_main_frame_start_time,
-                                     hold_commit_for_activation);
+    channel_main_->NotifyReadyToCommitOnImpl(&completion, layer_tree_host_,
+                                             begin_main_frame_start_time,
+                                             hold_commit_for_activation);
     completion.Wait();
   }