Disable some more tests in WorkerTest
Disable some more tests in WorkerTest

TBR=darin

These tests are failing on xp and vista:
WorkerTest.SingleWorker
WorkerTest.WorkerFastLayoutTests
WorkerTest.WorkerXhrHttpLayoutTests

Review URL: http://codereview.chromium.org/269056

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@28735 0039d316-1c4b-4281-b951-d872f2087c98

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