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ObjectId is the representation of the subscription topic from the
outdated Tango protocol.

It's not relevant to the new architecture, since subscription is represented
by topic name (in case of sync topic name is for example "BOOKMARKS" or
"PASSWORDS").

After this CL all code related to the FCMInvalidationService won't use the
ObjectId. But in some places the term Id still used. This is the subject for
follow up refactoring.


Bug: 878446, 801985
Change-Id: Idcf5bb464fff8976b319bd4721bdca2e3be77751
Reviewed-on: https://chromium-review.googlesource.com/1194032
Commit-Queue: Tatiana Gornak <melandory@chromium.org>
Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587904}