Move even more from WmShell to Shell

ash/display/display_util.cc

 // Copyright 2014 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/display/display_util.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "ash/common/new_window_controller.h"
@@ skipping 40 matching lines @@
 // A notification delegate that will start the feedback app when the notication
 // is clicked.
 class DisplayErrorNotificationDelegate
     : public message_center::NotificationDelegate {
  public:
   DisplayErrorNotificationDelegate() = default;
 
   // message_center::NotificationDelegate:
   void ButtonClick(int index) override {
     DCHECK_EQ(0, index);
-    WmShell::Get()->new_window_controller()->OpenFeedbackPage();
+    Shell::Get()->new_window_controller()->OpenFeedbackPage();
   }
 
  private:
   // Private destructor since NotificationDelegate is ref-counted.
   ~DisplayErrorNotificationDelegate() override = default;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayErrorNotificationDelegate);
 };
 
 
@@ skipping 130 matching lines @@
   message_center::NotificationList::Notifications notifications =
       message_center::MessageCenter::Get()->GetVisibleNotifications();
   for (auto* const notification : notifications) {
     if (notification->id() == kDisplayErrorNotificationId)
       return notification->message();
   }
   return base::string16();
 }
 
 }  // namespace ash