Suppress form validation test failures from a content shell change.
Suppress form validation test failures from a content shell change.

BUG=249237
TBR=tkent@chromium.org

Review URL: https://codereview.chromium.org/16924011

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152420 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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