Add suppression for RevocableStore leak

Fix a missing ... in a suppression for an infrequent warning
BUG=16625,17385
TEST=watch mac valgrind unit test bot go green

Review URL: http://codereview.chromium.org/159150

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21211 0039d316-1c4b-4281-b951-d872f2087c98