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This change updates the discovery-succeeds.html test to use the Web
Bluetooth Test interface. This will help us migrate the test to the wpt/
directory, since testRunner is not going to be used anymore.

BUG=509038

Change-Id: Id5d7d72e100c2d477d4690090b715eb549dfad99
Reviewed-on: https://chromium-review.googlesource.com/817754Reviewed-by: Conley Owens <cco3@chromium.org>
Reviewed-by: Vincent Scheib <scheib@chromium.org>
Commit-Queue: Vincent Scheib <scheib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523297}