Fix JSNI reference in JsJsonNumber.

Jsni method matching logic in GWT is being made more strict to better
handle wildcard matches.

A JSNI reference <class>::<method>(<signature>) will match methods in
<class> regardless of access modifiers, but only public methods on supers.
Also if more than one match is found an error is reported.

In this case an attempt to refer to a private method on JsJsonValue
through its subclass JsJsonString.

Change-Id: Ic12ee2e72a54b372f895816eddec9623d14c8790
1 file changed