DevTools: do not leak memory through event listeners

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

 // Copyright (c) 2015 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.
 
 /**
  * @extends {WebInspector.Object}
  * @constructor
  */
 WebInspector.ComputedStyleModel = function()
 {
@@ skipping 34 matching lines @@
         this._onComputedStyleChanged(null);
     },
 
     /**
      * @param {?WebInspector.Target} target
      */
     _updateTarget: function(target)
     {
         if (this._target === target)
             return;
-        if (this._targetEvents) {
+        if (this._targetEvents)
             WebInspector.EventTarget.removeEventListeners(this._targetEvents);
-            this._targetEvents = null;
-        }
         this._target = target;
 
         var domModel = null;
         var resourceTreeModel = null;
         if (target) {
             this._cssModel = WebInspector.CSSModel.fromTarget(target);
             domModel = WebInspector.DOMModel.fromTarget(target);
             resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
         }
 
@@ skipping 94 matching lines @@
 /**
  * @constructor
  * @param {!WebInspector.DOMNode} node
  * @param {!Map.<string, string>} computedStyle
  */
 WebInspector.ComputedStyleModel.ComputedStyle = function(node, computedStyle)
 {
     this.node = node;
     this.computedStyle = computedStyle;
 }