bumping the delayTestFinish timeout in ImageResourceTest.testDedup.  Maybe my XP machine was overloaded, but I'm bumping the half-second limit on local tests.

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@5528 8db76d5a-ed1c-0410-87a9-c151d255dfc7
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