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

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 315c5b8afac40076cbffd1a28952c9bf995caf0c..8e0493a8c1af61f5f87ab840f4ae5be1a468df18 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -673,10 +673,6 @@ void LayerTreeHost::DidLoseOutputSurface() {
   SetNeedsCommit();
 }
 
-void LayerTreeHost::FinishAllRendering() {
-  proxy_->FinishAllRendering();
-}
-
 void LayerTreeHost::SetDeferCommits(bool defer_commits) {
   proxy_->SetDeferCommits(defer_commits);
 }