Remove DisplayChangeObserver ash dependencies.

ash/system/chromeos/screen_layout_observer.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/system/chromeos/screen_layout_observer.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 14 matching lines @@
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/display/display.h"
 #include "ui/display/manager/display_manager.h"
 #include "ui/display/types/display_constants.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_delegate.h"
+#include "ui/strings/grit/ui_strings.h"
 
 using message_center::Notification;
 
 namespace ash {
 namespace {
 
 display::DisplayManager* GetDisplayManager() {
   return Shell::GetInstance()->display_manager();
 }
 
@@ skipping 65 matching lines @@
   int64_t external_id = display::kInvalidDisplayId;
   for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
     int64_t id = display_manager->GetDisplayAt(i).id();
     if (!display::Display::IsInternalDisplayId(id)) {
       external_id = id;
       break;
     }
   }
 
   if (external_id == display::kInvalidDisplayId)
-    return l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
+    return l10n_util::GetStringUTF16(IDS_DISPLAY_NAME_UNKNOWN);
 
   // The external display name may have an annotation of "(width x height)" in
   // case that the display is rotated or its resolution is changed.
   base::string16 name = GetDisplayName(external_id);
   const display::ManagedDisplayInfo& display_info =
       display_manager->GetDisplayInfo(external_id);
   if (display_info.GetActiveRotation() != display::Display::ROTATE_0 ||
       display_info.configured_ui_scale() != 1.0f ||
       !display_info.overscan_insets_in_dip().IsEmpty()) {
     name =
@@ skipping 175 matching lines @@
   if (!show_notifications_for_testing)
     return;
 
   base::string16 message;
   base::string16 additional_message;
   if (GetDisplayMessageForNotification(old_info, &message, &additional_message))
     CreateOrUpdateNotification(message, additional_message);
 }
 
 }  // namespace ash