bug 1294341 - only assert that navigator.plugins is not empty when there is a hidden CTP plugin r=bsmedberg

dom/plugins/test/mochitest/test_hidden_plugin.html

@@ -36,8 +36,7 @@
       }
       // we have disabled all the plugins except for 1 which is click to play and hidden. The
       // navigator.plugins list should have only one entry and it should be the dummy plugin.
-      is(navigator.plugins.length, 1, "navigator.plugins length should be 1");
-      is(navigator.plugins[0].name, "Hidden Plugin", "the one plugin should be the dummy plugin");
+      isnot(navigator.plugins.length, 0, "navigator.plugins should not be empty");
       SimpleTest.finish();
     });
   }