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This CL is a part of ObjectId -> Topic API migration. It's a pure
refactoring and there should be no behavioral changes.

Bug: 1029698
Change-Id: Ieab9c5a76c009a3ec93dd2a8737b9f9b6119a101
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2059376Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#743064}