MD Settings: Convert all usages of .bind(this) to use ES6 arrow function.

chrome/browser/resources/settings/bluetooth_page/bluetooth_device_dialog.js

 // Copyright 2016 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.
 
 cr.exportPath('settings');
 
 var PairingEventType = chrome.bluetoothPrivate.PairingEventType;
 
 // NOTE(dbeam): even though this behavior is only used privately, it must
 // be globally accessible for Closure's --polymer_pass to compile happily.
@@ skipping 222 matching lines @@
           device: this.pairingDevice,
           response: response
         };
     if (response == chrome.bluetoothPrivate.PairingResponse.CONFIRM) {
       var pairing = this.pairingEvent_.pairing;
       if (pairing == PairingEventType.REQUEST_PINCODE)
         options.pincode = this.$$('#pincode').value;
       else if (pairing == PairingEventType.REQUEST_PASSKEY)
         options.passkey = parseInt(this.$$('#passkey').value, 10);
     }
-    this.bluetoothPrivate.setPairingResponse(options, function() {
+    this.bluetoothPrivate.setPairingResponse(options, () => {
       if (chrome.runtime.lastError) {
         // TODO(stevenjb): Show error.
         console.error(
             'Error setting pairing response: ' + options.device.name +
             ': Response: ' + options.response +
             ': Error: ' + chrome.runtime.lastError.message);
       }
       this.close();
-    }.bind(this));
+    });
 
     this.fire('response', options);
   },
 
   /**
    * @param {!PairingEventType} eventType
    * @return {string}
    * @private
    */
   getEventDesc_: function(eventType) {
@@ skipping 123 matching lines @@
     this.getDialog_().cancel();
   },
 
   /** @private */
   onDialogCanceled_: function() {
     if (this.dialogId == 'pairDevice')
       this.sendResponse_(chrome.bluetoothPrivate.PairingResponse.CANCEL);
     this.endPairing();
   },
 });