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

chrome/browser/ui/webui/options/chromeos/display_overscan_handler.cc

 // Copyright (c) 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 "chrome/browser/ui/webui/options/chromeos/display_overscan_handler.h"
 
 #include <string>
 
 #include "ash/display/display_manager.h"
 #include "ash/display/window_tree_host_manager.h"
@@ skipping 13 matching lines @@
 namespace options {
 namespace {
 
 // The value for the orientation of overscan operations.
 const char kOrientationHorizontal[] = "horizontal";
 const char kOrientationVertical[] = "vertical";
 
 }
 
 DisplayOverscanHandler::DisplayOverscanHandler() {
-  ash::Shell::GetScreen()->AddObserver(this);
+  gfx::Screen::GetScreen()->AddObserver(this);
 }
 
 DisplayOverscanHandler::~DisplayOverscanHandler() {
-  ash::Shell::GetScreen()->RemoveObserver(this);
+  gfx::Screen::GetScreen()->RemoveObserver(this);
 }
 
 void DisplayOverscanHandler::GetLocalizedValues(
     base::DictionaryValue* localized_strings) {
   RegisterTitle(localized_strings, "displayOverscanPage",
                 IDS_OPTIONS_SETTINGS_DISPLAY_OVERSCAN_TAB_TITLE);
   localized_strings->SetString("shrinkAndExpand", l10n_util::GetStringUTF16(
       IDS_OPTIONS_SETTINGS_DISPLAY_OVERSCAN_SHRINK_EXPAND));
   localized_strings->SetString("move", l10n_util::GetStringUTF16(
       IDS_OPTIONS_SETTINGS_DISPLAY_OVERSCAN_MOVE));
@@ skipping 151 matching lines @@
     LOG(ERROR) << "The orientation must be '" << kOrientationHorizontal
                << "' or '" << kOrientationVertical << "': "
                << orientation;
     return;
   }
   overscan_calibrator_->UpdateInsets(insets);
 }
 
 }  // namespace options
 }  // namespace chromeos