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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: Ib8c5141ae28a0789df2a327d9d2305722edeeead
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1953110
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#725548}