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The suggestions were to use range-based for-loops instead of C-style
for-loops. I also noticed some opportunities to use <algorithm> instead
of raw loops, and made those changes as well.

Change-Id: Ic5bf82090ef6f7b5a0a6908b0df4d4aa9ca9a959
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584703
Commit-Queue: Chris Fredrickson <cfredric@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835883}