Move Singleton and related structs to namespace base

content/browser/in_process_io_surface_manager_mac.h

 // Copyright 2015 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 CONTENT_BROWSER_IN_PROCESS_IO_SURFACE_MANAGER_MAC_H_
 #define CONTENT_BROWSER_IN_PROCESS_IO_SURFACE_MANAGER_MAC_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/mac/scoped_mach_port.h"
 #include "base/macros.h"
@@ skipping 10 matching lines @@
   static InProcessIOSurfaceManager* GetInstance();
 
   // Overridden from IOSurfaceManager:
   bool RegisterIOSurface(IOSurfaceId io_surface_id,
                          int client_id,
                          IOSurfaceRef io_surface) override;
   void UnregisterIOSurface(IOSurfaceId io_surface_id, int client_id) override;
   IOSurfaceRef AcquireIOSurface(IOSurfaceId io_surface_id) override;
 
  private:
-  friend struct DefaultSingletonTraits<InProcessIOSurfaceManager>;
+  friend struct base::DefaultSingletonTraits<InProcessIOSurfaceManager>;
 
   InProcessIOSurfaceManager();
   ~InProcessIOSurfaceManager() override;
 
   using IOSurfaceMap =
       base::ScopedPtrHashMap<IOSurfaceId,
                              scoped_ptr<base::mac::ScopedMachSendRight>>;
   IOSurfaceMap io_surfaces_;
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessIOSurfaceManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_IO_SURFACE_MANAGER_MAC_H_