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

Bug: 936482
Change-Id: I03f8d6b061eed920ffd68305702f73fff66fe871
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844005Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#703611}