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Eventually this class should go away.
This CL removes obsolete parts
* Gaia screen - flow moved to the Views implementation
* RemoveUserDelegate - ditto

Bug: 1079199, 1067260
Change-Id: I231154e31b49eb5b645cd01b6e4605edb75f05c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253900
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780278}