Make ui::DisplayConfigurator a singleton

extensions/shell/browser/shell_desktop_controller_aura.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 "extensions/shell/browser/shell_desktop_controller_aura.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 148 matching lines @@
 
 }  // namespace
 
 ShellDesktopControllerAura::ShellDesktopControllerAura()
     : app_window_client_(new ShellAppWindowClient) {
   extensions::AppWindowClient::Set(app_window_client_.get());
 
 #if defined(OS_CHROMEOS)
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(
       this);
-  display_configurator_.reset(new ui::DisplayConfigurator);
+  display_configurator_ = DisplayConfigurator::GetInstance();
   display_configurator_->Init(false);
   display_configurator_->ForceInitialConfigure(0);
   display_configurator_->AddObserver(this);
 #endif
   CreateRootWindow();
 }
 
 ShellDesktopControllerAura::~ShellDesktopControllerAura() {
   CloseAppWindows();
   DestroyRootWindow();
@@ skipping 174 matching lines @@
   if (displays.empty())
     return gfx::Size();
   const ui::DisplayMode* mode = displays[0].display->current_mode();
   return mode ? mode->size() : gfx::Size();
 #else
   return gfx::Size();
 #endif
 }
 
 }  // namespace extensions