Cros: Remove unused ptr

Change-Id: I41431331a7aca745ee58edd116fbc9328ca3a178
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065335
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743077}

ash/shelf/hotseat_widget.h

@@ -17,10 +17,6 @@ namespace aura {
 class ScopedWindowTargeter;
 }
 
-namespace ui {
-class AnimationMetricsReporter;
-}
-
 namespace ash {
 class FocusCycler;
 class ScrollableShelfView;
@@ -157,11 +153,6 @@ class ASH_EXPORT HotseatWidget : public ShelfComponent,
   // of the hotseat.
   DelegateView* delegate_view_ = nullptr;
 
-  // Records animation smoothness metrics for movement animations of
-  // HotseatWidget.
-  std::unique_ptr<ui::AnimationMetricsReporter>
-      hotseat_animation_metrics_reporter_;
-
   // Whether the widget is currently extended because the user has manually
   // dragged it. This will be reset with any visible shelf configuration change.
   bool is_manually_extended_ = false;