Moves WindowCycleList/Controller to ash/common

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index e5968f7423d359720438319bf8a5baea80687c78..bbb4e20bb69fa3672d052c2232da58451625cebf 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -146,7 +146,6 @@ class VirtualKeyboardController;
 class VideoActivityNotifier;
 class VideoDetector;
 class WebNotificationTray;
-class WindowCycleController;
 class WindowPositioner;
 class WmShellAura;
 class WmWindow;
@@ -340,9 +339,6 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
     return lock_state_controller_.get();
   }
   VideoDetector* video_detector() { return video_detector_.get(); }
-  WindowCycleController* window_cycle_controller() {
-    return window_cycle_controller_.get();
-  }
   WindowTreeHostManager* window_tree_host_manager() {
     return window_tree_host_manager_.get();
   }
@@ -610,7 +606,6 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
   std::unique_ptr<LockStateController> lock_state_controller_;
   std::unique_ptr<ui::UserActivityDetector> user_activity_detector_;
   std::unique_ptr<VideoDetector> video_detector_;
-  std::unique_ptr<WindowCycleController> window_cycle_controller_;
   std::unique_ptr<WindowTreeHostManager> window_tree_host_manager_;
   std::unique_ptr<HighContrastController> high_contrast_controller_;
   std::unique_ptr<MagnificationController> magnification_controller_;