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This CL is doing a post-launch cleanup of Directory implementation of
wallet_data sync.

Follow-up CLs will remove the feature itself and metrics that were
needed only for the launch.

Bug: 936308
Change-Id: Id663c384b0bbb8a4811b6c1e0f10daf75545d4b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1609841
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Parastoo Geranmayeh <parastoog@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659437}