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This change refactors the Web Bluetooth test API to use the
DeviceUUIDs helper class defined in BluetoothDevice. Additionally,
this change finishes the implementation of SimulateGATTServicesChanged,
and as a result, tests are updated to set the next discovery response
before calling this interface.

BUG=719826

Change-Id: I0f986eb7afe6fbf7ebaa80ac4b633d46a027b80d
Reviewed-on: https://chromium-review.googlesource.com/939984
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541577}