Don't ignore passed attributes in InstallGetterSetter

Up until now, the passed attributes were completely ignored and we
defaulted to DONT_ENUM every time.

BUG=

Review-Url: https://codereview.chromium.org/2297193005
Cr-Commit-Position: refs/heads/master@{#39091}

src/js/prologue.js

@@ -120,7 +120,7 @@ function InstallGetterSetter(object, name, getter, setter, attributes) {
   SetFunctionName(setter, name, "set");
   %FunctionRemovePrototype(getter);
   %FunctionRemovePrototype(setter);
-  %DefineAccessorPropertyUnchecked(object, name, getter, setter, DONT_ENUM);
+  %DefineAccessorPropertyUnchecked(object, name, getter, setter, attributes);
   %SetNativeFlag(getter);
   %SetNativeFlag(setter);
 }