bluetooth: Introduce SetLowEnergyAvailableForTesting

third_party/WebKit/LayoutTests/resources/web-bluetooth-test.js

 (() => {
   let mojo_;
 
   async function loadFakeBluetoothInterfaces() {
     if(typeof mojo_ !== 'undefined') {
       return mojo_;
     }
 
     if (typeof loadMojoModules === 'undefined') {
       throw 'Mojo is required for this API.'
     }
 
     mojo_ = await loadMojoModules('fakeBluetooth', [
       'mojo/public/js/bindings',
       'device/bluetooth/public/interfaces/test/fake_bluetooth.mojom'
     ]);
 
    [mojo_.bindings, mojo_.FakeBluetooth] = mojo_.modules;
     return mojo_;
   }
 
   class FakeBluetooth {
     constructor() {
       this.fake_bluetooth_ptr_ = undefined;
     }
 
     async setLEAvailability(available) {
       if (typeof available !== 'boolean') throw 'Type Not Supported';
       await (await this.getFakeBluetoothInterface_()).setLEAvailability(available);
-
-      // TODO(crbug.com/569709): Remove once FakeBluetooth.setLEAvailability is
-      // implemented in the browser.
-      navigator.bluetooth.requestDevice = function() {
-        return Promise.reject(new DOMException(
-            'Bluetooth Low Energy is not supported on this platform.',
-            'NotFoundError'));
-        };
     }
 
     async getFakeBluetoothInterface_() {
       if (typeof this.fake_bluetooth_ptr_ !== 'undefined') {
         return this.fake_bluetooth_ptr_;
       }
 
       let mojo = await loadFakeBluetoothInterfaces();
 
       this.fake_bluetooth_ptr_ = new mojo.FakeBluetooth.FakeBluetoothPtr(
       mojo.interfaces.getInterface(
         mojo.FakeBluetooth.FakeBluetooth.name));
 
       return this.fake_bluetooth_ptr_;
     }
   }
 
   navigator.bluetooth.test = new FakeBluetooth();
 })();