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There is an edge case where ARC returns an empty list of handlers for
tel links. Usually there is at least the Contacts app installed but in
case there was an error we still want to append devices to select from.

With this change we always call through
ShowExternalProtocolDialogWithoutApps which then calls
ShowFallbackExternalProtocolDialog if there are no devices.

Test: Added a test case that verifies that for an empty list of apps we
correctly show the external protocol dialog with devices.

Bug: 1020155
Change-Id: Idb55d8548d8c428c6864a3f6cdf50baa8ffff663
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890440Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712728}