Make ui::DisplayConfigurator a singleton

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/accelerator_controller.h"
@@ skipping 620 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, private:
 
 Shell::Shell(ShellDelegate* delegate)
     : target_root_window_(NULL),
       scoped_target_root_window_(NULL),
       delegate_(delegate),
       window_positioner_(new WindowPositioner),
       activation_client_(NULL),
 #if defined(OS_CHROMEOS)
-      display_configurator_(new ui::DisplayConfigurator()),
+      display_configurator_(ui::DisplayConfigurator::GetInstance()),
 #endif  // defined(OS_CHROMEOS)
       native_cursor_manager_(new AshNativeCursorManager),
       cursor_manager_(
           scoped_ptr<::wm::NativeCursorManager>(native_cursor_manager_)),
       simulate_modal_window_open_for_testing_(false),
       is_touch_hud_projection_enabled_(false) {
   DCHECK(delegate_.get());
   gpu_support_.reset(delegate_->CreateGPUSupport());
   display_manager_.reset(new DisplayManager);
   display_controller_.reset(new DisplayController);
@@ skipping 518 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, aura::client::ActivationChangeObserver implementation:
 
 void Shell::OnWindowActivated(aura::Window* gained_active,
                               aura::Window* lost_active) {
   if (gained_active)
     target_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash