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This change updates the gc-detach.html and detach-gc.html tests to use
promise_test as opposed to async_test. This will help us migrate the
tests to the wpt/ directory, since we use a wrapper around
promise_test to dynamically load Chromium-specific modules.

This change also updates gc-detach.html and detach-gc.html to use
health-thermometer-iframe.html in order to use
getHealthThermometerDevice rather than setBluetoothFakeAdapter. As a
result, health-thermometer-iframe.html now contains a
"RequestAndConnect" message case, and bluetooth-helpers.js does not
rely on the "Ready" message from the health-thermometer-iframe.html
anymore.

Additionally, bluetooth-helpers.js now contains a function called
setUpConnectableHealthThermometerDevice that sets up a
fake_peripheral without requesting the device for tests that require
the device to be requested outside of the main frame.

BUG=769412

Change-Id: I310fd68569fb646e9e4e2ffde202b8f953a47e9b
Reviewed-on: https://chromium-review.googlesource.com/777339
Commit-Queue: Ovidio Henriquez <odejesush@google.com>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521584}