Moves Shell::maximize_mode_controller() to WmShell

ash/frame/caption_buttons/frame_caption_button_container_view.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/frame/caption_buttons/frame_caption_button_container_view.h"
 
 #include <cmath>
 #include <map>
 
 #include "ash/common/ash_switches.h"
@@ skipping 290 matching lines @@
 
   FrameCaptionButton::Animate fcb_animate =
       (animate == ANIMATE_YES) ? FrameCaptionButton::ANIMATE_YES
                                : FrameCaptionButton::ANIMATE_NO;
   auto it = button_icon_id_map_.find(icon);
   if (it != button_icon_id_map_.end())
     button->SetImage(icon, fcb_animate, it->second);
 }
 
 bool FrameCaptionButtonContainerView::ShouldSizeButtonBeVisible() const {
-  return !Shell::GetInstance()
+  return !WmShell::Get()
               ->maximize_mode_controller()
               ->IsMaximizeModeWindowManagerEnabled() &&
          frame_->widget_delegate()->CanMaximize();
 }
 
 void FrameCaptionButtonContainerView::ButtonPressed(views::Button* sender,
                                                     const ui::Event& event) {
   // Abort any animations of the button icons.
   SetButtonsToNormal(ANIMATE_NO);
 
@@ skipping 85 matching lines @@
     views::Button::ButtonState new_state = views::Button::STATE_NORMAL;
     if (button == to_hover)
       new_state = views::Button::STATE_HOVERED;
     else if (button == to_press)
       new_state = views::Button::STATE_PRESSED;
     button->SetState(new_state);
   }
 }
 
 }  // namespace ash