Moves Shell::maximize_mode_controller() to WmShell

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/ash_switches.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
@@ skipping 50 matching lines @@
   if (controller_->ShutdownRequested())
     return;
 
   // Avoid starting the lock/shutdown sequence if the power button is pressed
   // while the screen is off (http://crbug.com/128451), unless an external
   // display is still on (http://crosbug.com/p/24912).
   if (brightness_is_zero_ && !internal_display_off_and_external_display_on_)
     return;
 
   if (volume_down_pressed_ && down &&
-      Shell::GetInstance()
+      WmShell::Get()
           ->maximize_mode_controller()
           ->IsMaximizeModeWindowManagerEnabled()) {
     Shell::GetInstance()->accelerator_controller()->PerformActionIfEnabled(
         TAKE_SCREENSHOT);
     return;
   }
 
   const SessionStateDelegate* session_state_delegate =
       WmShell::Get()->GetSessionStateDelegate();
   if (has_legacy_power_button_) {
@@ skipping 10 matching lines @@
       }
     }
   } else {  // !has_legacy_power_button_
     if (down) {
       // If we already have a pending request to lock the screen, wait.
       if (controller_->LockRequested())
         return;
 
       if (session_state_delegate->CanLockScreen() &&
           !session_state_delegate->IsUserSessionBlocked()) {
-        if (Shell::GetInstance()
+        if (WmShell::Get()
                 ->maximize_mode_controller()
                 ->IsMaximizeModeWindowManagerEnabled() &&
             enable_quick_lock_)
           controller_->StartLockAnimationAndLockImmediately(true);
         else
           controller_->StartLockAnimation(true);
       } else {
         controller_->StartShutdownAnimation();
       }
     } else {  // Button is up.
@@ skipping 45 matching lines @@
     } else if (display->current_mode()) {
       external_display_on = true;
     }
   }
   internal_display_off_and_external_display_on_ =
       internal_display_off && external_display_on;
 }
 #endif
 
 }  // namespace ash