| Index: cc/trees/layer_tree_host_impl.h | 
| diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h | 
| index 6b53b46c2d93cc0762504f59fb46855a80443b63..0dedc808d238a1ec7b19874b1c025dc297e2fc61 100644 | 
| --- a/cc/trees/layer_tree_host_impl.h | 
| +++ b/cc/trees/layer_tree_host_impl.h | 
| @@ -823,9 +823,8 @@ class CC_EXPORT LayerTreeHostImpl | 
|  | 
| // Map from scroll element ID to scrollbar animation controller. | 
| // There is one animation controller per pair of overlay scrollbars. | 
| -  std::unordered_map<ElementId, | 
| -                     std::unique_ptr<ScrollbarAnimationController>, | 
| -                     ElementIdHash> | 
| +  std::unordered_map<ElementId::Id, | 
| +                     std::unique_ptr<ScrollbarAnimationController>> | 
| scrollbar_animation_controllers_; | 
|  | 
| RenderingStatsInstrumentation* rendering_stats_instrumentation_; | 
|  |