Fixes issue #1761 by adding parentheses around the qualifier of an invocation when appropriate.

Note: I screwed up this check-in and fixed it in r1798.

Found by: mmastrac
Patch by: sgross
Review by: me


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1794 8db76d5a-ed1c-0410-87a9-c151d255dfc7