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Test extension should be well-formed. Having warnings is often an early
indicator that something else is wrong (see for example https://chromiumcodereview.appspot.com/10852016/).

Review URL: https://chromiumcodereview.appspot.com/10826157

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151123 0039d316-1c4b-4281-b951-d872f2087c98