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

Bug: 936482
Change-Id: Ib47255e7cbcdc0701491357bb21aea8d18d0602e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895018Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#713316}