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This will be manually testable by checking for NotifyClientDimensions messages logged by hosts, once the host end logging is enabled.

DO NOT COMMIT THIS UNTIL CL 10262035 HAS LANDED.

BUG=110212

Review URL: http://codereview.chromium.org/10265033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134846 0039d316-1c4b-4281-b951-d872f2087c98