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This allows me to change one of the callers to not parse the
"REVISION=1234" output, which will allow me to change that output
in a future change.

BUG=41264

Review URL: http://codereview.chromium.org/6265021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72170 0039d316-1c4b-4281-b951-d872f2087c98