Bluetooth: add Device events, and cleanup JS API

chrome/test/data/extensions/api_test/bluetooth/get_devices/runtest.js

 // Copyright (c) 2012 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.
 
 function testGetDevices() {
-  chrome.test.assertEq(2, devices['all'].length);
-  chrome.test.assertEq('d1', devices['all'][0].name);
-  chrome.test.assertEq('d2', devices['all'][1].name);
-
-  chrome.test.assertEq(1, devices['uuid'].length);
-  chrome.test.assertEq('d2', devices['uuid'][0].name);
+  chrome.test.assertEq(2, devices.length);
+  chrome.test.assertEq('d1', devices[0].name);
+  chrome.test.assertEq('d2', devices[1].name);
 
   chrome.test.succeed();
 }
 
-var devices = {
-  'all': [],
-  'uuid': []
-};
-
-function recordDevicesInto(arrayKey) {
-  return function(device) {
-    devices[arrayKey].push(device);
-  };
-}
+var devices = null;
 
 function failOnError() {
   if (chrome.runtime.lastError) {
     chrome.test.fail(chrome.runtime.lastError.message);
   }
 }
 
 chrome.bluetooth.getDevices(
-  {deviceCallback: recordDevicesInto('all')},
-  function() {
+  function(result) {
     failOnError();
-    chrome.bluetooth.getDevices(
-      {
-        profile: {uuid: '00000010-0000-1000-8000-00805f9b34fb'},
-        deviceCallback: recordDevicesInto('uuid')
-      },
-      function() {
-        failOnError();
-        chrome.test.sendMessage('ready',
-          function(message) {
-            chrome.test.runTests([testGetDevices]);
-          });
+    devices = result;
+    chrome.test.sendMessage('ready',
+      function(message) {
+        chrome.test.runTests([testGetDevices]);
       });
   });