Remove now-unnecessary wrappers around gfx::Screen::GetScreen()

ash/wm/window_animations.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/window_animations.h"
 
 #include <math.h>
 #include <algorithm>
 #include <utility>
 #include <vector>
 
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
-#include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace_controller.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/stl_util.h"
 #include "base/time/time.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
@@ skipping 459 matching lines @@
           break;
       }
       return item_rect;
     }
   }
 
   // Coming here, there is no visible icon of that shelf item and we zoom back
   // to the location of the application launcher (which is fixed as first item
   // of the shelf).
   gfx::Rect work_area =
-      Shell::GetScreen()->GetDisplayNearestWindow(window).work_area();
+      gfx::Screen::GetScreen()->GetDisplayNearestWindow(window).work_area();
   int ltr_adjusted_x = base::i18n::IsRTL() ? work_area.right() : work_area.x();
   switch (layout_manager->GetAlignment()) {
     case SHELF_ALIGNMENT_BOTTOM:
       return gfx::Rect(ltr_adjusted_x, work_area.bottom(), 0, 0);
     case SHELF_ALIGNMENT_TOP:
       return gfx::Rect(ltr_adjusted_x, work_area.y(), 0, 0);
     case SHELF_ALIGNMENT_LEFT:
       return gfx::Rect(work_area.x(), work_area.y(), 0, 0);
     case SHELF_ALIGNMENT_RIGHT:
       return gfx::Rect(work_area.right(), work_area.y(), 0, 0);
   }
   NOTREACHED();
   return gfx::Rect();
 }
 
 }  // namespace ash