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This CL converts IdentityAccessorPtr and BindingSet<IdentityAccessor>
in chromeos and services to the new Mojo type.

Bug: 955171
Change-Id: Icb122470713bd84a6718483853f50aff45df1b8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810449Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#698654}