Do not use BuiltinLocalsFieldMixin for the DiffCommitListField

Review Request #8542 — Created Nov. 15, 2016 and submitted — Latest diff uploaded

Information

Review Board
dvcs

Reviewers

The DiffCommitListField was using the BuiltinLocalsFieldMixin but
not taking advantage of it because it required the data in the actual
review request view as well as in the change description portions. Since
it was building all the data itself anyway, this class no longer uses
the mixin.

It still works!