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This reverts commit e2d335fb.

Reason for revert: This CL triggers a compile error.

Bug: 1110221

Original change's description:
> Mac SxS: Don't ask to take default from other Chromium channels
> 
> If another channel of Chromium is already default, don't ask to
> become default.
> 
> Bug: 1109417
> Change-Id: I095410b47a64731c7ca7fbafa5f3e3427ec89d42
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318193
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Commit-Queue: Avi Drissman <avi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792144}

TBR=avi@chromium.org,mark@chromium.org

Change-Id: I59a405e113cca1abc28c9c01c34166d572c60c31
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1109417
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2322008Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792171}