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Stolen from https://codereview.chromium.org/118373003

BUG=397019

Review URL: https://codereview.chromium.org/488353004

Cr-Commit-Position: refs/heads/master@{#291283}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291283 0039d316-1c4b-4281-b951-d872f2087c98