Moves Shell::maximize_mode_controller() to WmShell

ash/system/chromeos/brightness/tray_brightness.cc

 // Copyright 2013 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/system/chromeos/brightness/tray_brightness.h"
 
 #include <algorithm>
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/common/ash_constants.h"
@@ skipping 96 matching lines @@
   slider_ = new views::Slider(this, views::Slider::HORIZONTAL);
   slider_->set_focus_border_color(kFocusBorderColor);
   slider_->SetValue(static_cast<float>(initial_percent / 100.0));
   slider_->SetAccessibleName(
       ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
           IDS_ASH_STATUS_TRAY_BRIGHTNESS));
   AddChildView(slider_);
 
   if (is_default_view_) {
     WmShell::Get()->AddShellObserver(this);
-    SetVisible(Shell::GetInstance()
+    SetVisible(WmShell::Get()
                    ->maximize_mode_controller()
                    ->IsMaximizeModeWindowManagerEnabled());
   }
 }
 
 BrightnessView::~BrightnessView() {
   if (is_default_view_)
     WmShell::Get()->RemoveShellObserver(this);
 }
 
@@ skipping 143 matching lines @@
   if (!display::Display::HasInternalDisplay())
     return;
 
   if (brightness_view_)
     SetDetailedViewCloseDelay(kTrayPopupAutoCloseDelayInSeconds);
   else
     PopupDetailedView(kTrayPopupAutoCloseDelayInSeconds, false);
 }
 
 }  // namespace ash