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Using IsFirstSetupComplete() to determine whether sync metadata should
be cleared does not work well for transport-only mode, where sync the
feature itself is not enabled and hence IsFirstSetupComplete() actually
never becomes true.

Therefore, prior to this patch, sync metadata (including the cache GUID)
were cleared on every browser restart, if in transport mode.

Instead, we leverage sync disable reasons to determine whether metadata
should be cleared.

Bug: 955989
Change-Id: I63d2b1e682193cd981c7cef72581a4c6e4057e49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715822
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683284}