Folds methods in WmShellCommon to WmShell

ash/wm/screen_pinning_controller.h

 // Copyright 2016 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.
 
 #ifndef ASH_WM_SCREEN_PINNING_CONTROLLER_H_
 #define ASH_WM_SCREEN_PINNING_CONTROLLER_H_
 
 #include <memory>
 #include <vector>
 
 #include "ash/display/window_tree_host_manager.h"
 #include "base/macros.h"
 
 namespace ash {
 
 class WindowTreeHostManager;
-class WmShellCommon;
 class WmWindow;
 
 // Handles pinned state.
 class ScreenPinningController : public WindowTreeHostManager::Observer {
  public:
-  ScreenPinningController(WmShellCommon* wm_shell_common,
-                          WindowTreeHostManager* window_tree_host_manager);
+  explicit ScreenPinningController(
+      WindowTreeHostManager* window_tree_host_manager);
   ~ScreenPinningController() override;
 
   // Sets a pinned window. It is not allowed to call this when there already
   // is a pinned window.
   void SetPinnedWindow(WmWindow* pinned_window);
 
   // Returns true if in pinned mode, otherwise false.
   bool IsPinned() const;
 
   // Returns the pinned window if in pinned mode, or nullptr.
@@ skipping 46 matching lines @@
   // Not owned. The parent has its ownership.
   WmWindow* background_window_ = nullptr;
 
   // In pinned mode, all displays other than the one where pinned_window_ is.
   // Similar to background_window_, not owned.
   std::vector<WmWindow*> dim_windows_;
 
   // Set true only when restacking done by this controller.
   bool in_restacking_ = false;
 
-  // For OnPinnedStateChanged event notification.
-  // While this controller is alive, it needs to be ensured that the instances
-  // refered from the pointers should be alive.
-  WmShellCommon* wm_shell_common_;
-
   // Keep references to remove this as a observer.
   // While this controller is alive, it needs to be ensured that the instances
   // refered from the pointers should be alive.
   WindowTreeHostManager* window_tree_host_manager_;
 
   // Window observers to translate events for the window to this controller.
   std::unique_ptr<PinnedContainerWindowObserver>
       pinned_container_window_observer_;
   std::unique_ptr<PinnedContainerChildWindowObserver>
       pinned_container_child_window_observer_;
   std::unique_ptr<SystemModalContainerWindowObserver>
       system_modal_container_window_observer_;
   std::unique_ptr<SystemModalContainerChildWindowObserver>
       system_modal_container_child_window_observer_;
   std::unique_ptr<DimWindowObserver> dim_window_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenPinningController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_SCREEN_PINNING_CONTROLLER_H_