GitLab

Platform apps do not use an Options page. This change makes OptionsPageHandler
a no-op when parsing a platform app manifest.

BUG=229584

Review URL: https://chromiumcodereview.appspot.com/14130005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194801 0039d316-1c4b-4281-b951-d872f2087c98