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This CL is the first CL to remove the per-UnifiedConsent code from
the sync confirmation dialog. The pre-UnifiedConsent sync confirmation
HTML and JS are still for the case when sync is disabled by policy.

Follow-up CLs will attempt to do the clean-up for these cases.

Bug: 971183

Change-Id: I9b24b5b23fad9a0658ebea0ab0c80f3157e530ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645358Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Auto-Submit: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667253}