Replace template_util.h stuff with C++11 <type_traits>

base/callback.h

 // 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.
 
 #ifndef BASE_CALLBACK_H_
 #define BASE_CALLBACK_H_
 
 #include "base/callback_forward.h"
 #include "base/callback_internal.h"
-#include "base/template_util.h"
 
 // NOTE: Header files that do not require the full definition of Callback or
 // Closure should #include "base/callback_forward.h" instead of this file.
 
 // -----------------------------------------------------------------------------
 // Introduction
 // -----------------------------------------------------------------------------
 //
 // The templated Callback class is a generalized function object. Together
 // with the Bind() function in bind.h, they provide a type-safe method for
@@ skipping 375 matching lines @@
 
  private:
   using PolymorphicInvoke =
       R(*)(internal::BindStateBase*,
            typename internal::CallbackParamTraits<Args>::ForwardType...);
 };
 
 }  // namespace base
 
 #endif  // BASE_CALLBACK_H_