Making docShell not assert when global history can't be added. Someone is doing something stupid in viewer right that makes the service fail.

git-svn-id: svn://10.0.0.236/trunk@66143 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/docshell/base/nsDocShell.cpp

@@ -2748,6 +2748,9 @@ NS_IMETHODIMP nsDocShell::ShouldAddToGlobalHistory(nsIURI* aURI,
 
 NS_IMETHODIMP nsDocShell::AddToGlobalHistory(nsIURI* aURI)
 {
+   if(NS_FAILED(EnsureGlobalHistory()))
+      return NS_ERROR_FAILURE;  // XXX REMOVE THIS!!!!
+
    NS_ENSURE_SUCCESS(EnsureGlobalHistory(), NS_ERROR_FAILURE);
 
    nsXPIDLCString spec;