tidy up gwt:test config.
tidy up gwt:test config.

hcoles/truth,dahlstrom-g/truth,andyglick/truth0,cgruber/truth,cgruber/truth,google/truth,kidaa/truth,andyglick/truth0,google/truth,kidaa/truth,dahlstrom-g/truth,hcoles/truth,google/truth