What steps will reproduce the problem?
(1) Use the "non-deprecated" Rietveld UI
(2) Visit https://codereview.chromium.org/2272793007#msg17

What is the expected output?
The comments in the automated email/comment are in the same order as the files.

What do you see instead?
The .h file is before the .cc file in the patch listing.
The .cc file is before the .h file in the emailed comment.

In cases where someone goes through the files in order, comments on something in one file, and then comments on a realization in the other, the realization is emailed before the first comment. This is unexpectedly confusing.