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This will simplify the addition of a tool to check licenses for the purpose of
the Android WebView build.

See also http://codereview.chromium.org/10827099

Also adds other missing fields to these README.chromium files as required by
presubmit checks and fixes a regex used to enforce this.

BUG=138921

Review URL: https://chromiumcodereview.appspot.com/10821103

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149423 0039d316-1c4b-4281-b951-d872f2087c98