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Currently it's possible to run all the Pedals code but not actually show
the Pedals if the button row Feature is not enabled. This change makes
the dependence of Pedals on button row explicit.

Bug: 893183
Change-Id: Ib30cec31fa21e8dac138aa0341ace6bc8ea124ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362993
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799249}