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This change converts DocumentCoordinationUnit mojom interface
client in components to use BrowserInterfaceBroker.
Since DocumentCoordinationUnit is a WebContentsObserver and a static
helper function is used to register its binder.

Bug: 936482
Change-Id: I146d28c81a39b4f977f53c92b567f6409e727553
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895026Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#716094}