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Currently, _CheckUniquePtr is run both on upload and on commit. This
check emits errors, which means commit is blocked if it fires. At the
same time, it has a history of false positives (one mentioned in
https://crrev.com/c/933547, another in https://crbug.com/827961).

Therefore this CL makes _CheckUniquePtr an upload-only check.

Bug: 827961
Change-Id: I6d5a7f3dda33432ae1375359c2ae573e5ad3df34
Reviewed-on: https://chromium-review.googlesource.com/990133Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548760}