Revert 156348 (caused http://crbug.com/149828)

chrome/test/data/extensions/api_test/bluetooth/test_getdevices_concurrently.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 testGetDevicesConcurrently() {
-  chrome.test.assertEq(1, errors.length);
-
-  var kExpectedError = "Concurrent calls to getDevices are not allowed.";
-  chrome.test.assertEq(kExpectedError, errors[0]);
-
-  chrome.test.succeed();
-}
-
-function nop() {}
-
-var errors = [];
-function recordError() {
-  if (chrome.runtime.lastError) {
-    errors.push(chrome.runtime.lastError.message);
-  }
-}
-
-var getDevicesOptions = { deviceCallback:nop, name:'foo' };
-chrome.experimental.bluetooth.getDevices(getDevicesOptions, recordError);
-chrome.experimental.bluetooth.getDevices(getDevicesOptions, recordError);
-chrome.test.sendMessage('ready',
-    function(message) {
-      chrome.test.runTests([
-          testGetDevicesConcurrently
-      ]);
-  });