Backed out changeset 5b56257d0547 (bug 771273)

dom/browser-element/BrowserElementChild.js

@@ -65,10 +65,6 @@ BrowserElementChild.prototype = {
                                  Ci.nsIWebProgress.NOTIFY_SECURITY |
                                  Ci.nsIWebProgress.NOTIFY_STATE_WINDOW);
 
-    docShell.QueryInterface(Ci.nsIWebNavigation)
-            .sessionHistory = Cc["@mozilla.org/browser/shistory;1"]
-                                .createInstance(Ci.nsISHistory);
-
     // This is necessary to get security web progress notifications.
     var securityUI = Cc['@mozilla.org/secure_browser_ui;1']
                        .createInstance(Ci.nsISecureBrowserUI);