oauth: fix pom.xml hg url https://codereview.appspot.com/7818045/
oauth: fix pom.xml hg url
https://codereview.appspot.com/7818045/

GoProjectOwner/google-oauth-java-client,markyen/google-oauth-java-client,GoProjectOwner/google-oauth-java-client,aungzanbaw/google-oauth-java-client,googleapis/google-oauth-java-client,aungzanbaw/google-oauth-java-client,wgpshashank/google-oauth-java-client,chanseokoh/google-oauth-java-client,wgpshashank/google-oauth-java-client,chanseokoh/google-oauth-java-client,googleapis/google-oauth-java-client,coursera4ashok/google-oauth-java-client,coursera4ashok/google-oauth-java-client,markyen/google-oauth-java-client,googleapis/google-oauth-java-client