Move Singleton and related structs to namespace base

chrome/browser/ui/views/app_list/win/app_list_service_win.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_APP_LIST_WIN_APP_LIST_SERVICE_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_APP_LIST_WIN_APP_LIST_SERVICE_WIN_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/app_list/app_list_service_views.h"
 
 class ActivationTrackerWin;
 
+namespace base {
 template <typename T> struct DefaultSingletonTraits;
+}
 
 class AppListServiceWin : public AppListServiceViews {
  public:
   ~AppListServiceWin() override;
 
   static AppListServiceWin* GetInstance();
 
   // AppListService overrides:
   void SetAppListNextPaintCallback(void (*callback)()) override;
   void Init(Profile* initial_profile) override;
   void ShowForProfile(Profile* requested_profile) override;
   void CreateShortcut() override;
 
  private:
-  friend struct DefaultSingletonTraits<AppListServiceWin>;
+  friend struct base::DefaultSingletonTraits<AppListServiceWin>;
 
   // AppListServiceViews overrides:
   void OnViewBeingDestroyed() override;
 
   // AppListShowerDelegate overrides:
   void OnViewCreated() override;
   void OnViewDismissed() override;
   void MoveNearCursor(app_list::AppListView* view) override;
 
   AppListServiceWin();
 
   bool IsWarmupNeeded();
   void ScheduleWarmup();
 
   // Loads the profile last used with the app list and populates the view from
   // it without showing it so that the next show is faster. Does nothing if the
   // view already exists, or another profile is in the middle of being loaded to
   // be shown.
   void LoadProfileForWarmup();
   void OnLoadProfileForWarmup(Profile* initial_profile);
 
   scoped_ptr<ActivationTrackerWin> activation_tracker_;
 
   base::Closure next_paint_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListServiceWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_APP_LIST_WIN_APP_LIST_SERVICE_WIN_H_