[Mac] Remove bug_26964 valgrind suppression.
[Mac] Remove bug_26964 valgrind suppression.

I cannot repro locally, and the bot logs do not show the suppression
ever firing.  Reviewing the specific log, there was a timeout starting
the Chromium subprocess for one test (which failed), I suspect that
the resulting unclean shutdown may be related.

BUG=26964
TEST=valgrind stays green.

Review URL: http://codereview.chromium.org/415002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@32542 0039d316-1c4b-4281-b951-d872f2087c98

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