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These no longer need to be in the shared components/chrome_cleaner directory
because new versions of Chrome do not use them to communicate with the cleaner.
The cleaner itself still needs to build against them so that the cleaner can
communicate with older versions of chrome that set kChromeMojoPipeTokenSwitch
on the command-line.

Also split out FilePath, RegistryKey and ExtensionId into a new
footprints.mojom interface, to eliminate some bogus dependencies on
chrome_prompt.mojom.

R=proberge

Bug: 969139
Change-Id: Ib6f5b2dbf6f08d389453bcea86d52cdc5b078bec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903956Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Reviewed-by: proberge <proberge@chromium.org>
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714502}