bluetooth: Refactor Bluetooth and Stub out BluetoothInteraction.

Source/modules/bluetooth/Bluetooth.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "modules/bluetooth/Bluetooth.h"
+
+#include "bindings/core/v8/ScriptPromise.h"
+
+namespace blink {
+
+ScriptPromise Bluetooth::requestDevice(ScriptState* s)
+{
+    return bluetoothDiscovery()->requestDevice(s);
+}
+
+BluetoothDiscovery* Bluetooth::bluetoothDiscovery()
+{
+    if (!m_bluetoothDiscovery)
+        m_bluetoothDiscovery = new BluetoothDiscovery;
+    return m_bluetoothDiscovery.get();
+}
+
+}; // blink