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Also, ensure that it stays in sync with the renderer's copy.

BUG=99379,369661
TEST=no CHECKs hit in the wild, all tests stay green

Review URL: https://codereview.chromium.org/423393008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288196 0039d316-1c4b-4281-b951-d872f2087c98