Add back SequencedWorkerPool suppression.
Add back SequencedWorkerPool suppression.

I still see these leaks on the drmemory full bot, but not the heapcheck
or memcheck bots.

TBR=akalin@chromium.org
BUG=115987
TEST=

Review URL: https://chromiumcodereview.appspot.com/9540013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@124218 0039d316-1c4b-4281-b951-d872f2087c98

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