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The API for sending the redirect URL is specified by the .proto file.
The endpoint is still passed in a command line switch.

Bug: 984021
Change-Id: I38fae8c86a942eae91ba3be3ad4eaa95701748d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787322
Commit-Queue: Kamila Śledź <kamilasledz@google.com>
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695570}