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RunArcExternalProtocolDialog takes a callback rather than creating the
ExternalProtocolDialog directly.  This is to allow further logic to be
added consistently in the case where arc does not handle the URL.

Bug: b/168506505
Change-Id: I82e74112870cb727e46b0a3ab987e7117a4ac7d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423067
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809559}