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This CL eliminates the override readiness and execution logic to make
the Pedal for updating Chrome rely on the base implementation with
navigation to chrome://settings/help . Other URLs are also updated
to stay in sync with targets agreed upon with PM & UX. Related unit
tests are also eliminated.

Bug: 893183
Change-Id: Iaaf2a02700449932d198331a0856cb7c926c145e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314160Reviewed-by: manuk hovanesian <manukh@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791285}