ash/wm: Remove dead code.

ash/shell.h

 // 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.
 
 #ifndef ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 51 matching lines @@
 class NonClientFrameView;
 class Widget;
 namespace corewm {
 class TooltipController;
 }
 }
 
 namespace wm {
 class AcceleratorFilter;
 class CompoundEventFilter;
-class NestedAcceleratorController;
 class ShadowController;
 class VisibilityController;
 class WindowModalityController;
 }
 
 namespace ash {
 
 class AcceleratorController;
 class AccessibilityDelegate;
 class AppListController;
@@ skipping 551 matching lines @@
   // |target_root_window_| never becomes NULL during the session.
   aura::Window* target_root_window_;
   aura::Window* scoped_target_root_window_;
 
   // The CompoundEventFilter owned by aura::Env object.
   scoped_ptr< ::wm::CompoundEventFilter> env_filter_;
 
   std::vector<WindowAndBoundsPair> to_restore_;
 
   scoped_ptr<UserMetricsRecorder> user_metrics_recorder_;
-  scoped_ptr< ::wm::NestedAcceleratorController> nested_accelerator_controller_;
   scoped_ptr<AcceleratorController> accelerator_controller_;
   scoped_ptr<ShellDelegate> delegate_;
   scoped_ptr<SystemTrayDelegate> system_tray_delegate_;
   scoped_ptr<SystemTrayNotifier> system_tray_notifier_;
   scoped_ptr<UserWallpaperDelegate> user_wallpaper_delegate_;
   scoped_ptr<SessionStateDelegate> session_state_delegate_;
   scoped_ptr<AccessibilityDelegate> accessibility_delegate_;
   scoped_ptr<NewWindowDelegate> new_window_delegate_;
   scoped_ptr<MediaDelegate> media_delegate_;
   scoped_ptr<ShelfDelegate> shelf_delegate_;
@@ skipping 112 matching lines @@
   scoped_ptr<GPUSupport> gpu_support_;
 
   base::SequencedWorkerPool* blocking_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_