Make sure gmock is included when doing a checkout of the RLZ project.  Seems
like the way this dependency was being picked has changed.  Will commit TBR.
Review URL: http://codereview.appspot.com/4432087

git-svn-id: http://rlz.googlecode.com/svn/trunk@37 10bc0f33-e4bf-9a86-80cf-af638054f0c4