bluetooth: Remove disconnect when page hidden

third_party/WebKit/LayoutTests/bluetooth/resources/bluetooth-helpers.js

 'use strict';
 
 // Bluetooth UUID constants:
 // Services:
 var blacklist_test_service_uuid = "611c954a-263b-4f4a-aab6-01ddb953f985";
 // Characteristics:
 var blacklist_exclude_reads_characteristic_uuid =
   "bad1c9a2-9a5b-4015-8b60-1579bbbf2135";
 
 // Sometimes we need to test that using either the name, alias, or UUID
@@ skipping 304 matching lines @@
   // At the end of each test we clean up all the leftover data in the browser,
   // including revoking permissions. This happens before the test document is
   // detached. Once the document is detached any device that connected tries
   // to disconnect but by then the document no longer has permission to
   // interact with the device. So before we clean up the browser data
   // we change the visibility which results in all devices disconnecing.
   // TODO(ortuno): Remove setPageVisibility hack. In the future, the browser
   // will notify the renderer that the device disconnected so we won't need
   // this hack.
   // https://crbug.com/581855
-  testRunner.setPageVisibility('hidden');
-  testRunner.setPageVisibility('visible');
   testRunner.setBluetoothManualChooser(false);
   setBluetoothFakeAdapter('');
 });