Remove base::enable_if

gin/wrappable.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 GIN_WRAPPABLE_H_
 #define GIN_WRAPPABLE_H_
 
+#include <type_traits>
+
 #include "base/template_util.h"
 #include "gin/converter.h"
 #include "gin/gin_export.h"
 #include "gin/public/wrapper_info.h"
 
 namespace gin {
 
 // Wrappable is a base class for C++ objects that have corresponding v8 wrapper
 // objects. To retain a Wrappable object on the stack, use a gin::Handle.
 //
@@ skipping 76 matching lines @@
  protected:
   Wrappable() {}
   virtual ~Wrappable() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Wrappable);
 };
 
 
 // This converter handles any subclass of Wrappable.
-template<typename T>
-struct Converter<T*, typename base::enable_if<
-                       base::is_convertible<T*, WrappableBase*>::value>::type> {
+template <typename T>
+struct Converter<T*,
+                 typename std::enable_if<
+                     base::is_convertible<T*, WrappableBase*>::value>::type> {
   static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, T* val) {
     return val->GetWrapper(isolate);
   }
 
   static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val, T** out) {
     *out = static_cast<T*>(static_cast<WrappableBase*>(
         internal::FromV8Impl(isolate, val, &T::kWrapperInfo)));
     return *out != NULL;
   }
 };
 
 }  // namespace gin
 
 #endif  // GIN_WRAPPABLE_H_