Dave Borowitz c15bbc845f Store ChangeControl instead of ChangeNotes in CodeReviewCommit
We want to be able to use ApprovalCopier when generating the list of
approvals that goes in the cherry-pick commit message, which requires
the ChangeControl.

Exposed a couple of subtle bugs in merge code expecting one Change
object to be mutated when it was in fact another.

Change-Id: Iad025a0b7a54306bc3b636cc28f484ee0baf534b
2014-02-06 12:38:07 -08:00
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