mash: Migrate some misc ShelfLayoutManager deps to ash common.

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 9e180adfb821763049466e2c1918d0cf7989ba2e..934a08db2652e2c2ad4d44f5435e3a1fea33a0d0 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -32,7 +32,6 @@ class ImplicitAnimationObserver;
 namespace ash {
 
 class PanelLayoutManagerTest;
-class ShelfBezelEventFilter;
 class ShelfLayoutManagerObserver;
 class ShelfLayoutManagerTest;
 class ShelfWidget;
@@ -134,7 +133,6 @@ class ASH_EXPORT ShelfLayoutManager
 
   // Overridden from ShellObserver:
   void OnLockStateChanged(bool locked) override;
-  void OnShelfAlignmentChanged(WmWindow* root_window) override;
   void OnShelfAutoHideBehaviorChanged(WmWindow* root_window) override;
   void OnPinnedStateChanged(WmWindow* pinned_window) override;
 
@@ -324,9 +322,6 @@ class ASH_EXPORT ShelfLayoutManager
   // False when neither the auto hide timer nor the timer task are running.
   bool mouse_over_shelf_when_auto_hide_timer_started_;
 
-  // EventFilter used to detect when user issues a gesture on a bezel sensor.
-  std::unique_ptr<ShelfBezelEventFilter> bezel_event_filter_;
-
   base::ObserverList<ShelfLayoutManagerObserver> observers_;
 
   // The shelf reacts to gesture-drags, and can be set to auto-hide for certain