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This change also removes some now-unneeded instance vars.

Bug: 1075649
Change-Id: Ibac05c4b28f6f89f40bb153ba63bd3f46d075b00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252920
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781506}