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This change converts KeyboardLockService mojom interface client in
blink to use BrowserInterfaceBroker.

Bug: 936482
Change-Id: I3e6e2e6cb1c50bd83d6f8ccea881c546150eae54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816073
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700110}