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This deprecates two of the three "boolean success" fields in the protocol.
The errors are indicated through standard protocol means, in case
the method returns a non-error result, success is always set to true.

Change-Id: Iada79f5c50d08112a996dad192e1c3cfc86fe6ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425305
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810464}