Valgrind: Remove suppression for bug 91491 which has been fixed.
Valgrind: Remove suppression for bug 91491 which has been fixed.

TBR=groby
BUG=91491
TEST=none

Review URL: http://codereview.chromium.org/7837015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99862 0039d316-1c4b-4281-b951-d872f2087c98

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