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This fixes a bunch of "use of non-const ref" lint errors in a nicer way
than just changing everything to pointers, since it's a reasonable API.

NOPRESUBMIT=true

Bug: none
Change-Id: I894724ffb05db2e450f76db9d0b788c14c833a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2126253
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754746}