Move AcceleratorController from WmShell to Shell

ash/wm/power_button_controller.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/power_button_controller.h"
 
 #include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/ash_switches.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/chromeos/audio/tray_audio.h"
@@ skipping 73 matching lines @@
   // display is still on (http://crosbug.com/p/24912).
   if (brightness_is_zero_ && !internal_display_off_and_external_display_on_)
     return;
 
   // Take screenshot on power button down plus volume down when in touch view.
   if (should_take_screenshot) {
     SystemTray* system_tray = Shell::GetInstance()->GetPrimarySystemTray();
     if (system_tray && system_tray->GetTrayAudio())
       system_tray->GetTrayAudio()->HideDetailedView(false);
 
-    WmShell::Get()->accelerator_controller()->PerformActionIfEnabled(
+    Shell::Get()->accelerator_controller()->PerformActionIfEnabled(
         TAKE_SCREENSHOT);
 
     // Restore volume.
     chromeos::CrasAudioHandler* audio_handler =
         chromeos::CrasAudioHandler::Get();
     audio_handler->SetOutputVolumePercentWithoutNotifyingObservers(
         volume_percent_before_screenshot_,
         chromeos::CrasAudioHandler::VOLUME_CHANGE_MAXIMIZE_MODE_SCREENSHOT);
     return;
   }
@@ skipping 86 matching lines @@
       internal_display_off && external_display_on;
 }
 
 void PowerButtonController::PowerButtonEventReceived(
     bool down,
     const base::TimeTicks& timestamp) {
   OnPowerButtonEvent(down, timestamp);
 }
 
 }  // namespace ash