Remove suppression for issue 28279 which is marked Fixed.
Remove suppression for issue 28279 which is marked Fixed.

To be marked verified after a green cycle.
BUG=28279
TEST=Verify green unit_tests. Verify this bug.

Review URL: http://codereview.chromium.org/523022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@35464 0039d316-1c4b-4281-b951-d872f2087c98

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