cc: Make the ScopedPtrVector and ScopedPtrDeque containers act like STL vector and deque.

cc/layer_tree_impl.cc

Index: cc/layer_tree_impl.cc
diff --git a/cc/layer_tree_impl.cc b/cc/layer_tree_impl.cc
index e07fa03d2b0c43b7fbfa2ee2e2c119a55c2059c5..ca0c926eb2f15f1cc2430e50260c9fb0dc45b0c2 100644
--- a/cc/layer_tree_impl.cc
+++ b/cc/layer_tree_impl.cc
@@ -157,7 +157,7 @@ const LayerTreeImpl::LayerList& LayerTreeImpl::RenderSurfaceLayerList() const {
 gfx::Size LayerTreeImpl::ContentSize() const {
   // TODO(aelias): Hardcoding the first child here is weird. Think of
   // a cleaner way to get the contentBounds on the Impl side.
-  if (!root_scroll_layer() || root_scroll_layer()->children().isEmpty())
+  if (!root_scroll_layer() || root_scroll_layer()->children().empty())
     return gfx::Size();
   return root_scroll_layer()->children()[0]->contentBounds();
 }