Bug 1294341 - Also skip the test on linux64 because tests were failing

--HG--
extra : rebase_source : b06fad52c1d6406dc63b8ccd20b1fb6a9bf622d6

dom/plugins/test/mochitest/mochitest.ini

@@ -74,7 +74,7 @@ skip-if = !crashreporter || e10s
 [test_hanging.html]
 skip-if = !crashreporter || e10s
 [test_hidden_plugin.html]
-skip-if = os == "linux" && bits == 32
+skip-if = os == "linux"
 [test_instance_re-parent.html]
 skip-if = release_build # Bug 1172627
 [test_instance_unparent1.html]