Remove deprecation messages after the update to Guava 8

thanks for the cleanup

On Thu Sep 25 2014 at 11:35:53 AM Tyler Breisacher <notifications@github.com>
wrote:

> In src/com/google/javascript/jscomp/newtypes/DeclaredFunctionType.java:
>
> > @@ -240,7 +240,7 @@ private static JSType nullAcceptingMeet(JSType t1, JSType t2) {
> >
> >    @Override
> >    public String toString() {
> > -    return Objects.toStringHelper(this.getClass())
> > +    return MoreObjects.toStringHelper(this.getClass())
>
> Actually, it looks like we can just use toStringHelper(this) now, and
> Guava will get the class name automatically.
>
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> <https://github.com/google/closure-compiler/pull/639/files#r18050565>.
>