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

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

Index: third_party/WebKit/Source/devtools/front_end/ui/Popover.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/Popover.js b/third_party/WebKit/Source/devtools/front_end/ui/Popover.js
index e41df7d5de27db1eec9f1248d691c065ffc09abe..fc6dd925b18b1f6c27e0171913bdfb8b2079e550 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/Popover.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/Popover.js
@@ -254,16 +254,10 @@ WebInspector.Popover.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);
@@ -273,6 +267,18 @@ WebInspector.PopoverHelper = function(panelElement, getAnchor, showPopover, onHi
 
 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
      */