Move Change out of AbstractChangeNotes
In order to load all draft PatchLineComments for a given author, we
will need to be able to scan all the refs in their namespace of the
All-Users repository and load the drafts in without access to a Change
object (we will just have the ChangeId from the refname). Therefore, I
removed that field from AbstractChangeNotes and put the Change object
just in ChangeNotes because some callers of ChangeNotes need the
Change object. I put the ChangeId in the AbstractChangeNotes instead,
since both ChangeNotes and DraftCommentNotes need that.
Change-Id: Icd3b72b10dd39a205c3ec420b25a6740b9d376af
4 files changed
