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This CL converts FuchsiaCdmProvider mojom interface client in
content and media/fuchsia/cdm to use BrowserInterfaceBroker.
WebEngineContentBrowserClient derived from ContentBrowserClient
registers FuchsiaCdmProvider's binder.

Bug: 936482
Change-Id: I7062658611074dac7e2697d6592415ce984c7b2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1924092Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#718111}