SurfaceAggregator should check whether output is secure when drawin

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 3c3b4dca247b317f5f19751dacaa07a13b0501d9..201a0fa1323433289c9df812eaf60897fd277069 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -880,10 +880,6 @@ void SingleThreadProxy::UpdateTopControlsState(TopControlsState constraints,
   NOTREACHED() << "Top Controls are used only in threaded mode";
 }
 
-void SingleThreadProxy::SetOutputIsSecure(bool output_is_secure) {
-  layer_tree_host_impl_->set_output_is_secure(output_is_secure);
-}
-
 void SingleThreadProxy::DidFinishImplFrame() {
   layer_tree_host_impl_->DidFinishImplFrame();
 #if DCHECK_IS_ON()