Fix bug # 20542: make global history flush-able, and try and flush in on Shutdown()

suite/browser/navigator.js

@@ -164,6 +164,16 @@ function Shutdown()
   {
   }
 
+  try
+  {
+    // give history a change at flushing to disk also
+    var history = getService( "component://netscape/browser/global-history", "nsIRDFRemoteDataSource" );
+    if (history)	history.Flush();
+  }
+  catch (ex)
+  {
+  }
+
   if ( appCore )
     appCore.close();
 }