DevTools: use shorthand syntax in interface definitions.

third_party/WebKit/Source/devtools/front_end/sdk/TracingManager.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.
  */
 /**
  * @interface
  */
 SDK.TracingManagerClient = function() {};
 
 SDK.TracingManagerClient.prototype = {
-  tracingStarted: function() {},
+  tracingStarted() {},
   /**
    * @param {!Array.<!SDK.TracingManager.EventPayload>} events
    */
-  traceEventsCollected: function(events) {},
-  tracingComplete: function() {},
+  traceEventsCollected(events) {},
+  tracingComplete() {},
   /**
    * @param {number} usage
    */
-  tracingBufferUsage: function(usage) {},
+  tracingBufferUsage(usage) {},
   /**
    * @param {number} progress
    */
-  eventsRetrievalProgress: function(progress) {}
+  eventsRetrievalProgress(progress) {}
 };
 
 /**
  * @unrestricted
  */
 SDK.TracingManager = class {
   /**
    * @param {!SDK.Target} target
    */
   constructor(target) {
@@ skipping 124 matching lines @@
     this._tracingManager._eventsCollected(data);
   }
 
   /**
    * @override
    */
   tracingComplete() {
     this._tracingManager._tracingComplete();
   }
 };