reverting the part of rev 1.198 that causes a 100% reproducible, impossible to miss crash every time a browser window is closed, and seems to do nothing else. bug 47491

xpfe/browser/resources/content/navigator.js

@@ -64,8 +64,6 @@ catch (ex)
   var backButton	= null;
   var forwardButton = null;
 
-  var webNavigation = null;
-
   var useRealProgressFlag = false;
   var totalRequests = 0;
   var finishedRequests = 0;
@@ -429,14 +427,6 @@ function Startup()
       contentArea.addEventListener("load",postURLToNativeWidget, true);
     }
 
-    // Get the content area docshell
-    var docShell = { value : null };
-    var result = appCore.getContentDocShell(docShell);            
-    if (docShell.value) {
-        //Get the session history component from docshell
-        webNavigation = docShell.value.QueryInterface(Components.interfaces.nsIWebNavigation);
-    }
-
     dump("*** Pulling out the charset\n");
     if ( window.arguments && window.arguments[1] ) {
         if (window.arguments[1].indexOf('charset=') != -1) {