[DevTools] Cleanup DOMExtension.js.

third_party/WebKit/Source/devtools/front_end/elements/ComputedStyleWidget.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 189 matching lines @@
                 name: propertyName,
                 value: propertyValue
             };
             var isOdd = this._propertiesOutline.rootElement().children().length % 2 === 0;
             treeElement.listItemElement.classList.toggle("odd-row", isOdd);
             this._propertiesOutline.appendChild(treeElement);
 
             var trace = propertyTraces.get(propertyName);
             if (trace) {
                 var activeProperty = this._renderPropertyTrace(cssModel, matchedStyles, nodeStyle.node, treeElement, trace);
-                treeElement.listItemElement.addEventListener("mousedown", consumeEvent, false);
-                treeElement.listItemElement.addEventListener("dblclick", consumeEvent, false);
+                treeElement.listItemElement.addEventListener("mousedown", (e) => e.consume(), false);
+                treeElement.listItemElement.addEventListener("dblclick", (e) => e.consume(), false);
                 treeElement.listItemElement.addEventListener("click", handleClick.bind(null, treeElement), false);
                 var gotoSourceElement = propertyValueElement.createChild("div", "goto-source-icon");
                 gotoSourceElement.addEventListener("click", this._navigateToSource.bind(this, activeProperty));
                 if (expandedProperties.has(propertyName))
                     treeElement.expand();
             }
         }
 
         this._updateFilter(this._filterRegex);
 
@@ skipping 14 matching lines @@
         /**
          * @param {!TreeElement} treeElement
          * @param {!Event} event
          */
         function handleClick(treeElement, event)
         {
             if (!treeElement.expanded)
                 treeElement.expand();
             else
                 treeElement.collapse();
-            consumeEvent(event);
+            event.consume();
         }
     },
 
     /**
      * @param {!WebInspector.CSSProperty} cssProperty
      * @param {!Event} event
      */
     _navigateToSource: function(cssProperty, event)
     {
         WebInspector.Revealer.reveal(cssProperty);
@@ skipping 94 matching lines @@
         var children = this._propertiesOutline.rootElement().children();
         for (var child of children) {
             var property = child[WebInspector.ComputedStyleWidget._propertySymbol];
             var matched = !regex || regex.test(property.name) || regex.test(property.value);
             child.hidden = !matched;
         }
     },
 
     __proto__: WebInspector.ThrottledWidget.prototype
 }