Adding Valgrind Suppression to bring webkit valgrind canary green.
Adding Valgrind Suppression to bring webkit valgrind canary green.

Starting seeing failure in
  http://build.chromium.org/buildbot/waterfall.fyi/builders/Webkit%20Linux%20(valgrind%20webkit.org)/builds/16864/steps/memory%20test:%20test_shell/logs/stdio

No obvious cause found yet since the change just marked a test flaky.

BUG=58321
TEST=none
TBR=tkent

Review URL: http://codereview.chromium.org/3564020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@61812 0039d316-1c4b-4281-b951-d872f2087c98

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