[Extensions] Convert APIs to use movable types [13]

extensions/browser/api/system_display/system_display_api.cc

 // Copyright 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 "extensions/browser/api/system_display/system_display_api.h"
 
 #include <string>
 
 #include "build/build_config.h"
 #include "extensions/browser/api/system_display/display_info_provider.h"
 #include "extensions/common/api/system_display.h"
 
 #if defined(OS_CHROMEOS)
 #include "base/memory/scoped_ptr.h"
 #include "extensions/common/manifest_handlers/kiosk_mode_info.h"
 #include "ui/gfx/screen.h"
 #endif
 
 namespace extensions {
 
 using api::system_display::DisplayUnitInfo;
 
 namespace SetDisplayProperties = api::system_display::SetDisplayProperties;
 
-typedef std::vector<linked_ptr<api::system_display::DisplayUnitInfo>>
-    DisplayInfo;
-
 bool SystemDisplayGetInfoFunction::RunSync() {
   DisplayInfo all_displays_info =
       DisplayInfoProvider::Get()->GetAllDisplaysInfo();
   results_ = api::system_display::GetInfo::Results::Create(all_displays_info);
   return true;
 }
 
 bool SystemDisplaySetDisplayPropertiesFunction::RunSync() {
 #if !defined(OS_CHROMEOS)
   SetError("Function available only on ChromeOS.");
@@ skipping 20 matching lines @@
   return false;
 #else
   scoped_ptr<api::system_display::EnableUnifiedDesktop::Params> params(
       api::system_display::EnableUnifiedDesktop::Params::Create(*args_));
   DisplayInfoProvider::Get()->EnableUnifiedDesktop(params->enabled);
   return true;
 #endif
 }
 
 }  // namespace extensions