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Registry keys removed or changed by the cleaner will be shown to the
user on the Settings page card and need to be provided by the cleaner
via the Mojo IPC. Those keys are only used for visualization (no
validation will be done by Chrome) and we don't intend to add any
sophisticated visualization support (such as expandable trees); because
of that, we decided to go with the simplest approach and only transmit
lists of strings instead of more structured data.

This CL only propagates registry keys to the places they may be used,
so most files in this CL are simply adding a new parameter to
functions. A follow-up CL will actually use the new parameter in UI
code.

Bug: 776538
Change-Id: Ifd9faf79eea070d17452356c45ae37482bf77864
Reviewed-on: https://chromium-review.googlesource.com/780287
Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519487}