Fix PPApiTest's early return condition for AshBrowserTests as in https://chromiumcodereview.appspot.com/21112003.

Forgot that one as it didn't use the same generic early return comment as the other ones...

BUG=263548

Review URL: https://codereview.chromium.org/25634010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226578 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226578