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diff --git a/base/singleton_internal.h b/base/singleton_internal.h
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--- a/base/singleton_internal.h
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-// Copyright 2008, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//    * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//    * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//    * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef BASE_SINGLETON_INTERNAL_H__
-#define BASE_SINGLETON_INTERNAL_H__
-
-// Define the storage of the singleton pointer.
-template <typename Type, typename DifferentiatingType, bool kVolatile>
-class SingletonStorage {
- protected:
-  // The actual pointer. Note that it is a volatile pointer.
-  static Type* volatile instance_;
-};
-
-// Partial specialization.
-template <typename Type, typename DifferentiatingType>
-class SingletonStorage<Type, DifferentiatingType, false> {
- protected:
-  // The pointer does not need to be volatile for use with pthread_once or
-  // locked initialization.
-  static Type* instance_;
-};
-
-template <typename Type, typename DifferentiatingType, bool kVolatile>
-Type* volatile SingletonStorage<Type, DifferentiatingType,
-                                kVolatile>::instance_ = NULL;
-
-template <typename Type, typename DifferentiatingType>
-Type* SingletonStorage<Type, DifferentiatingType, false>::instance_ = NULL;
-
-template<bool kUseVolatile>
-struct UseVolatileSingleton {
-#ifdef WIN32
-  static const bool value = kUseVolatile;
-#else
-  static const bool value = false;
-#endif  // WIN32
-};
-
-#endif  // BASE_SINGLETON_INTERNAL_H__