Exclude IndexedDBUILayoutTest.WorkerLayoutTests on Valgrind Mac b/c it's failing like IndexedDBUILayoutTest.LayoutTests
Exclude IndexedDBUILayoutTest.WorkerLayoutTests on Valgrind Mac b/c it's failing like IndexedDBUILayoutTest.LayoutTests

BUG=110612
TBR=dgrogan@chromium.org
TEST=

Review URL: https://chromiumcodereview.appspot.com/9706026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@126673 0039d316-1c4b-4281-b951-d872f2087c98

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