*** Submitted:
Refactor to callback services API
R=benjamin.saller CC= https://codereview.appspot.com/99660043
https://codereview.appspot.com/99660043/
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*** Submitted:
Refactor to callback services API
R=benjamin.saller /codereview. appspot. com/99660043
CC=
https:/
https:/ /codereview. appspot. com/99660043/