DevTools: use shorthand syntax in interface definitions.

third_party/WebKit/Source/devtools/front_end/ui/StaticViewportControl.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.
 /**
  * @unrestricted
  */
 UI.StaticViewportControl = class {
   /**
    * @param {!UI.StaticViewportControl.Provider} provider
    */
@@ skipping 130 matching lines @@
 /**
  * @interface
  */
 UI.StaticViewportControl.Provider = function() {};
 
 UI.StaticViewportControl.Provider.prototype = {
   /**
    * @param {number} index
    * @return {number}
    */
-  fastItemHeight: function(index) {
+  fastItemHeight(index) {
     return 0;
   },
 
   /**
    * @return {number}
    */
-  itemCount: function() {
+  itemCount() {
     return 0;
   },
 
   /**
    * @param {number} index
    * @return {?Element}
    */
-  itemElement: function(index) {
+  itemElement(index) {
     return null;
   }
 };