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This patch removes Sync.Entities.PositioningScheme histogram from code
and marks it as obsolete.

Bug: 1089540.
Change-Id: I43155064094bbcea207fcdc3ea9fc558b18a7990
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2235833Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#776876}