Bug 1013870 - Implement isValidFragment() in GeckoPreferences (r=liuche)

mobile/android/base/preferences/GeckoPreferences.java

@@ -383,6 +383,11 @@ OnSharedPreferenceChangeListener
         intent.putExtra(PreferenceActivity.EXTRA_SHOW_FRAGMENT_ARGUMENTS, fragmentArgs);
     }
 
+    @Override
+    public boolean isValidFragment(String fragmentName) {
+        return GeckoPreferenceFragment.class.getName().equals(fragmentName);
+    }
+
     @Override
     public void onBuildHeaders(List<Header> target) {
         if (onIsMultiPane()) {