Remove current implementation of frame timing events.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index f3188f6c8df9534b71d0a20488362734dbf43df1..e41da4b42d2ff4c642daddb280da95b26ebfb46d 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -119,22 +119,6 @@ void LayerTreeImpl::RecreateResources() {
   }
 }
 
-void LayerTreeImpl::GatherFrameTimingRequestIds(
-    std::vector<int64_t>* request_ids) {
-  if (!root_layer_)
-    return;
-
-  // TODO(vmpstr): Early out if there are no requests on any of the layers. For
-  // that, we need to inform LayerTreeImpl whenever there are requests when we
-  // get them.
-  LayerTreeHostCommon::CallFunctionForEveryLayer(
-      this,
-      [request_ids](LayerImpl* layer) {
-        layer->GatherFrameTimingRequestIds(request_ids);
-      },
-      CallFunctionLayerType::ALL_LAYERS);
-}
-
 bool LayerTreeImpl::IsViewportLayerId(int id) const {
   if (id == inner_viewport_scroll_layer_id_ ||
       id == outer_viewport_scroll_layer_id_)