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Now that this is done, we don't need to leave the class files laying
around anymore. So don't.

Review URL: https://codereview.chromium.org/458653002

Cr-Commit-Position: refs/heads/master@{#288971}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288971 0039d316-1c4b-4281-b951-d872f2087c98