DevTools: do not allow using 'this' before call into super.

third_party/WebKit/Source/devtools/front_end/ui/Popover.js

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 236 matching lines @@
         this.element.style.width = newElementPosition.width + borderWidth * 2 + "px";
         this.element.style.height = newElementPosition.height + borderWidth * 2 + "px";
     },
 
     __proto__: WebInspector.Widget.prototype
 };
 
 /**
  * @constructor
  * @param {!Element} panelElement
- * @param {function(!Element, !Event):(!Element|!AnchorBox|undefined)} getAnchor
- * @param {function(!Element, !WebInspector.Popover):undefined} showPopover
- * @param {function()=} onHide
  * @param {boolean=} disableOnClick
  */
-WebInspector.PopoverHelper = function(panelElement, getAnchor, showPopover, onHide, disableOnClick)
+WebInspector.PopoverHelper = function(panelElement, disableOnClick)
 {
-    this._getAnchor = getAnchor;
-    this._showPopover = showPopover;
-    this._onHide = onHide;
     this._disableOnClick = !!disableOnClick;
     panelElement.addEventListener("mousedown", this._mouseDown.bind(this), false);
     panelElement.addEventListener("mousemove", this._mouseMove.bind(this), false);
     panelElement.addEventListener("mouseout", this._mouseOut.bind(this), false);
     this.setTimeout(1000, 500);
 };
 
 WebInspector.PopoverHelper.prototype = {
     /**
+     * @param {function(!Element, !Event):(!Element|!AnchorBox|undefined)} getAnchor
+     * @param {function(!Element, !WebInspector.Popover):undefined} showPopover
+     * @param {function()=} onHide
+     */
+    initializeCallbacks:function(getAnchor, showPopover, onHide)
+    {
+        this._getAnchor = getAnchor;
+        this._showPopover = showPopover;
+        this._onHide = onHide;
+    },
+
+    /**
      * @param {number} timeout
      * @param {number=} hideTimeout
      */
     setTimeout: function(timeout, hideTimeout)
     {
         this._timeout = timeout;
         if (typeof hideTimeout === "number")
             this._hideTimeout = hideTimeout;
         else
             this._hideTimeout = timeout / 2;
@@ skipping 132 matching lines @@
             this._resetHoverTimer();
         }
     }
 };
 
 /** @enum {string} */
 WebInspector.Popover.Orientation = {
     Top: "top",
     Bottom: "bottom"
 };