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This CL converts FingerprintObserverPtr and
FingerprintObserverRequest in chrome, services and ui to the new
Mojo type, and uses pending_remote<FingerprintObserver> in
fingerprint.mojom.

Bug: 955171
Change-Id: Ide42fdb94bc69b100b5fce68f672cc86ef6f7c27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792464
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696021}