Backing out my checkin to see if it fixes the Txul breakage

caps/src/nsScriptSecurityManager.cpp

@@ -1369,7 +1369,7 @@ nsScriptSecurityManager::GetRootDocShell(JSContext *cx, nsIDocShell **result)
     if (!scriptContext) return NS_ERROR_FAILURE;
     nsCOMPtr<nsIScriptGlobalObject> globalObject;
     scriptContext->GetGlobalObject(getter_AddRefs(globalObject));
-    if (!globalObject) return NS_ERROR_FAILURE;
+    if (!globalObject)  return NS_ERROR_FAILURE;
     rv = globalObject->GetDocShell(getter_AddRefs(docshell));
     if (NS_FAILED(rv)) return rv;
     nsCOMPtr<nsIDocShellTreeItem> docshellTreeItem(do_QueryInterface(docshell, &rv));
@@ -1415,32 +1415,15 @@ nsScriptSecurityManager::CanExecuteScripts(JSContext* cx,
     }
 
     //-- See if the current window allows JS execution
-    nsCOMPtr<nsIScriptContext> scriptContext = (nsIScriptContext*)JS_GetContextPrivate(cx);
-    if (!scriptContext) return NS_ERROR_FAILURE;
-    nsCOMPtr<nsIScriptGlobalObject> globalObject;
-    scriptContext->GetGlobalObject(getter_AddRefs(globalObject));
-    if (!globalObject) return NS_ERROR_FAILURE;
     nsCOMPtr<nsIDocShell> docshell;
-    rv = globalObject->GetDocShell(getter_AddRefs(docshell));
-    if (NS_FAILED(rv)) return rv;
-    nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(docshell));
-    if (!treeItem) return NS_ERROR_UNEXPECTED;
-    nsCOMPtr<nsIDocShellTreeItem> parentItem;
-    // Walk up the docshell tree to see if any containing docshell disallows scripts
-    do {
+    rv = GetRootDocShell(cx, getter_AddRefs(docshell));
+    if (NS_SUCCEEDED(rv))
+    {
         rv = docshell->GetAllowJavascript(result);
         if (NS_FAILED(rv)) return rv;
         if (!*result)
-            return NS_OK; // Do not run scripts
-        rv = treeItem->GetParent(getter_AddRefs(parentItem));
-        if (NS_FAILED(rv)) return rv;
-        if (parentItem)
-        {
-            treeItem = parentItem;
-            docshell = do_QueryInterface(treeItem, &rv);
-            if (NS_FAILED(rv)) return rv;
-        }
-    } while (parentItem);
+            return NS_OK;
+    }
 
     //-- See if JS is disabled globally (via prefs)
     *result = mIsJavaScriptEnabled;

docshell/base/nsIDocShell.idl

@@ -145,7 +145,7 @@ interface nsIDocShell : nsISupports
    * document. Note if you want to get the current URI, use the read-only
    * property on nsIWebNavigation.
    */ 
-  void setCurrentURI(in nsIURI aURI);
+  [noscript] void setCurrentURI(in nsIURI aURI);
 
   /**
    * Notify the associated content viewer and all child docshells that they are