Bug 104360 - Error: this.docShell has no properties in browser.xml. Patch by ajvincent, r/sr=neil

xpfe/global/resources/content/bindings/browser.xml

@@ -450,7 +450,6 @@
             this.mDragDropHandler.detach();
           this.mDragDropHandler = null;
 
-          this.securityUI = null;
           this.focusedWindow = null;
           this.focusedElement = null;
           this._webBrowserFind = null;