fixing EnvironmentManager::bindExprAndLocation()

Hi Ted,

Per your comment, I created a separate patch for the bug in
EnvironmentManager::bindExprAndLocation(). Please see it at:

http://codereview.appspot.com/3236042

Please let me know if it's OK for me to commit it. Thanks,

Looks good to me.

Thanks! I re-built and re-ran the tests and committed this in r119899.