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This CL removes GmsCoreSyncListener class and some harness around it.
This class was implemented for https://crbug.com/552106, but that
feature was never finished. This CL also removes
ProfileSyncService::GetCustomPassphraseKey that became unused.

Bug: 903284
Change-Id: I096b2ab74915d2ed93b4c4077902a1de9abb4cee
Reviewed-on: https://chromium-review.googlesource.com/c/1326502Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606809}