cc: Remove FinishAllRendering, as it doesn't do anything anymore.

cc/trees/remote_channel_main.cc

Index: cc/trees/remote_channel_main.cc
diff --git a/cc/trees/remote_channel_main.cc b/cc/trees/remote_channel_main.cc
index b9db7fa5f9d6f45162cf7bb4b15276b78acb5847..4487d094a0267fbc8b028557d3d189d3ca3e07f1 100644
--- a/cc/trees/remote_channel_main.cc
+++ b/cc/trees/remote_channel_main.cc
@@ -100,10 +100,6 @@ void RemoteChannelMain::SetDeferCommitsOnImpl(bool defer_commits) {
   SendMessageProto(proto);
 }
 
-void RemoteChannelMain::FinishAllRenderingOnImpl(CompletionEvent* completion) {
-  completion->Signal();
-}
-
 void RemoteChannelMain::SetVisibleOnImpl(bool visible) {
   NOTIMPLEMENTED() << "Visibility is not controlled by the server";
 }