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

chrome/browser/ui/window_sizer/window_sizer_ash_uitest.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/shelf/shelf.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shell.h"
 #include "ash/test/shelf_test_api.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 43 matching lines @@
 
   EXPECT_EQ(2, view_model->view_size());
   return view_model->view_at(1)->GetBoundsInScreen();
 }
 
 void OpenBrowserUsingShelfOnRootWindow(aura::Window* root_window) {
   ui::test::EventGenerator generator(root_window);
   gfx::Point center =
       GetChromeIconBoundsForRootWindow(root_window).CenterPoint();
   gfx::Display display =
-      ash::Shell::GetScreen()->GetDisplayNearestWindow(root_window);
+      gfx::Screen::GetScreen()->GetDisplayNearestWindow(root_window);
   const gfx::Point& origin = display.bounds().origin();
   center.Offset(- origin.x(), - origin.y());
   generator.MoveMouseTo(center);
   generator.ClickLeftButton();
 }
 
 }  // namespace
 
 #if !defined(OS_CHROMEOS)
 #define MAYBE_OpenBrowserUsingShelfOnOtherDisplay DISABLED_OpenBrowserUsingShelfOnOtherDisplay
@@ skipping 118 matching lines @@
 
   // Next new browser must be created on 1st display.
   ASSERT_EQ(2u, browser_list->size());
   EXPECT_EQ(root_windows[0],
             browser_list->get(1)->window()->GetNativeWindow()->GetRootWindow());
   EXPECT_EQ(root_windows[0], ash::Shell::GetTargetRootWindow());
 
   // Balanced with the chrome::IncrementKeepAliveCount above.
   chrome::DecrementKeepAliveCount();
 }