Add some more detail to assert error message. This should help in debugging failures, which don't otherwise do a good job of indicating where the failure occurred. TBR=szager@google.com Review URL: https://codereview.chromium.org/702923003 git-svn-id: http://src.chromium.org/svn/trunk/tools/deps2git@292856 4ff67af0-8c30-449e-8e8b-ad334ec8d88c 
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