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This CL migrates code to the new BrowserInterfaceBroker class. This
allows retrieving the remote implementation in the browser process
without relying on the InterfaceProvider API.

Bug: 936482, 1002647
Change-Id: I9be9e414f9574a556757ec4c11a5f73690e2906d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1969129
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726732}