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This reverts commit ed985006.

Reason for revert: I suspect this is the cause of several flaky
tests on mac, see crbug.com/1043665

Original change's description:
> [SyncSetup]: Change Sync everything to a radio behaviour.
> 
> As part of friendly settings, this CL implements changing |sync
> everything| from check box to radio button. The motivation behind this
> work is to clarify to users the difference between |Sync everything|
> checked and |Sync everything| unchecked but all single data types
> checked.
> 
> Bug: 1043122
> Change-Id: I579b8173a7b32f1416a3b1eda999196d177a2b5c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007730
> Commit-Queue: Monica Basta <msalama@chromium.org>
> Reviewed-by: Dan Beam <dbeam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#733286}

TBR=dbeam@chromium.org,msalama@chromium.org

Change-Id: Ibe071bf447abb103d3ae801069cf1f27a9123c67
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1043122
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011168Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733420}