Refactor screen/monitor so that gfx::Screen returns monitor object.

ash/wm/workspace/workspace_manager.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/workspace/workspace_manager.h"
 
 #include <algorithm>
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/window_animations.h"
 #include "ash/wm/window_resizer.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace/managed_workspace.h"
 #include "ash/wm/workspace/maximized_workspace.h"
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "ui/aura/env.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
-#include "ui/aura/monitor.h"
 #include "ui/aura/monitor_manager.h"
 #include "ui/aura/window.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/compositor/layer.h"
 #include "ui/gfx/compositor/layer_animator.h"
 #include "ui/gfx/compositor/scoped_layer_animation_settings.h"
+#include "ui/gfx/monitor.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/transform.h"
 
 namespace {
 
 // The horizontal margein between workspaces in pixels.
 const int kWorkspaceHorizontalMargin = 50;
 
 // Minimum/maximum scale for overview mode.
 const float kMaxOverviewScale = 0.9f;
@@ skipping 319 matching lines @@
   return workspace;
 }
 
 void WorkspaceManager::CleanupWorkspace(Workspace* workspace) {
   if (workspace->type() != Workspace::TYPE_MANAGED && workspace->is_empty())
     delete workspace;
 }
 
 }  // namespace internal
 }  // namespace ash