cc: Split Proxy and TaskRunnerProvider for the LayerTreeHost

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index d1a95bc963dd83a0fb875a57f19a63ac4bc74a6b..dc8598ea1f508ae69722b6d1f3f8488e23c4b644 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -1299,7 +1299,7 @@ void Layer::PushPropertiesTo(LayerImpl* layer) {
        it != copy_requests_.end();
        ++it) {
     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner =
-        layer_tree_host()->proxy()->MainThreadTaskRunner();
+        layer_tree_host()->task_runner_provider()->MainThreadTaskRunner();
     scoped_ptr<CopyOutputRequest> original_request = copy_requests_.take(it);
     const CopyOutputRequest& original_request_ref = *original_request;
     scoped_ptr<CopyOutputRequest> main_thread_request =