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Update comments and make helpers Objective-C style.

Bug: 1090424
Change-Id: I2c1fe5047360c23dbee12189e6411933ab4e9ccf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225847Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#774579}