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SyncTypesListDisabled allows admins to disable individual sync
"user selectable types" by name.

Extend it to work for OS types ("osApps", "osPreferences", and
"wifiConfigurations") as well. Add migration support. While we are
rolling out SplitSettingsSync the existing browser data types names
"apps" and "preferences" will control the migrated types.

Add unit tests for SyncTypesListDisabled to SyncPolicyHandler, for
both the existing behavior and the new behavior.

      disable "apps", "bookmarks" and "preferences". Verify that
      without the SplitSettingsSync flag those data type toggles
      are disabled in browser sync settings. Verify that with
      the SplitSettingsSync flag those toggles are disabled in
      OS settings (for apps and preferences) and in browser
      settings (for bookmarks).

Bug: 1058853
Test: Use test DM server to add SyncTypesListDisabled policy to
Test: added to components_unittests
Change-Id: Id3427b6611007f1d1a0701f4b2eeceff607c06b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090205
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748323}