Revert valgrind suppression for bug 89300
Revert valgrind suppression for bug 89300

IOThread doesn't register URLRequestContextGetters anymore. Stacktrace is out of date.

BUG=89300
TEST=none

Review URL: http://codereview.chromium.org/7888005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@100880 0039d316-1c4b-4281-b951-d872f2087c98

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