Remove base::enable_if

base/callback_internal.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.
 
 // This file contains utility functions and classes that help the
 // implementation, and management of the Callback objects.
 
 #ifndef BASE_CALLBACK_INTERNAL_H_
 #define BASE_CALLBACK_INTERNAL_H_
 
@@ skipping 187 matching lines @@
 //
 // In C++11, std::forward would replace all uses of this function.  However, it
 // is impossible to implement a general std::forward with C++11 due to a lack
 // of rvalue references.
 //
 // In addition to Callback/Bind, this is used by PostTaskAndReplyWithResult to
 // simulate std::forward() and forward the result of one Callback as a
 // parameter to another callback. This is to support Callbacks that return
 // the movable-but-not-copyable types whitelisted above.
 template <typename T>
-typename enable_if<!IsMoveOnlyType<T>::value, T>::type& CallbackForward(T& t) {
+typename std::enable_if<!IsMoveOnlyType<T>::value, T>::type& CallbackForward(
+    T& t) {
   return t;
 }
 
 template <typename T>
-typename enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward(T& t) {
+typename std::enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward(
+    T& t) {
   return t.Pass();
 }
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_CALLBACK_INTERNAL_H_