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With this change, all branding happens to the props file which is read
by the signing script.

BUG=None
TEST=None

Review URL: https://chromiumcodereview.appspot.com/10825193

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150006 0039d316-1c4b-4281-b951-d872f2087c98