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Previously, https://crrev.com/c/1681768 added migration logic from the
old "SyncSuppressed" pref to a new "SyncRequested" pref (which better
matches what it means, and has the correct default value). However, the
migration code was only triggered on non-iOS platforms, leaving iOS Sync
users in a bad state (new pref is used, but has no value).
The fix is simply to trigger the migration logic also in iOS's version
of browser_prefs. This also bring users back into a good state.

Bug: 906034
Change-Id: Ib52ea658bf616ca47e947980d2ddc1fb50f02b5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715285Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Marc Treib <treib@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680368}