DevTools: use shorthand syntax in interface definitions.

third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js

 /*
  * Copyright 2014 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.
  */
 
 /**
  * @unrestricted
  */
 SDK.TargetManager = class extends Common.Object {
@@ skipping 384 matching lines @@
 
 /**
  * @interface
  */
 SDK.TargetManager.Observer = function() {};
 
 SDK.TargetManager.Observer.prototype = {
   /**
    * @param {!SDK.Target} target
    */
-  targetAdded: function(target) {},
+  targetAdded(target) {},
 
   /**
    * @param {!SDK.Target} target
    */
-  targetRemoved: function(target) {},
+  targetRemoved(target) {},
 };
 
 /**
  * @type {!SDK.TargetManager}
  */
 SDK.targetManager = new SDK.TargetManager();