GitLab

Iteration order was implied but never stated before. We need to rely on
it for correctness. eg. crrev.com/c/2398449

Change-Id: I2050dffb44da68950261db319981537178fea2e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2407622
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809781}