Remove base::enable_if

gin/wrappable.h

Index: gin/wrappable.h
diff --git a/gin/wrappable.h b/gin/wrappable.h
index f7d82b0d5a71953cdc84ecec013d9094d5237848..e6c7a716b43a826f98ab26f7e0425e0a523401ec 100644
--- a/gin/wrappable.h
+++ b/gin/wrappable.h
@@ -5,6 +5,8 @@
 #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"
@@ -101,9 +103,10 @@ class Wrappable : public WrappableBase {
 
 
 // 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);
   }