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This CL converts crostini_upgrader::mojom::PageHandlerFactory
mojom interface clients for chrome os in chrome to use
BrowserInterfaceBroker.

Bug: 936482, 1002647
Change-Id: I9ccea33e088a8496f548a464e20bf2a29cde9cf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1969128
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726263}