Remove Shell::shelf()|status_area_widget()|launcher()

ash/wm/gestures/shelf_gesture_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/gestures/shelf_gesture_handler.h"
 
+#include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/wm/gestures/tray_gesture_handler.h"
 #include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/shelf_types.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
@@ skipping 16 matching lines @@
       shell->delegate()->IsScreenLocked()) {
     // The gestures are disabled in the lock/login screen.
     return false;
   }
 
   // The gesture are disabled for fullscreen windows.
   aura::Window* active = wm::GetActiveWindow();
   if (active && wm::IsWindowFullscreen(active))
     return false;
 
-  ShelfLayoutManager* shelf = shell->shelf();
+  // TODO(oshima): Find the root window controller from event's location.
+  ShelfLayoutManager* shelf = Shell::GetPrimaryRootWindowController()->shelf();
   if (event.type() == ui::ET_GESTURE_SCROLL_BEGIN) {
     drag_in_progress_ = true;
     shelf->StartGestureDrag(event);
     return true;
   }
 
   if (!drag_in_progress_)
     return false;
 
   if (event.type() == ui::ET_GESTURE_SCROLL_UPDATE) {
@@ skipping 21 matching lines @@
     return true;
   }
 
   // Unexpected event. Reset the state and let the event fall through.
   shelf->CancelGestureDrag();
   return false;
 }
 
 }  // namespace internal
 }  // namespace ash