Bump up Firefox version to 16 in MissingPlugin

Review by: acleung@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11338 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/MissingPlugin/war/MissingPlugin.html b/MissingPlugin/war/MissingPlugin.html
index eb709ae..271f641 100644
--- a/MissingPlugin/war/MissingPlugin.html
+++ b/MissingPlugin/war/MissingPlugin.html
@@ -173,7 +173,7 @@
       } else if (ua.indexOf("gecko") != -1) {
         // Note: Gecko version != Firefox version before 5.0.
         // See: https://developer.mozilla.org/en-US/docs/Gecko_user_agent_string_reference
-        var gecko_versions = ["1.9", "2.0", "5.0", "6.0", "7.0", "8.0", "9.0", "10.0", "11.0", "12.0", "13.0", "14.0", "15.0"];
+        var gecko_versions = ["1.9", "2.0", "5.0", "6.0", "7.0", "8.0", "9.0", "10.0", "11.0", "12.0", "13.0", "14.0", "15.0", "16.0"];
         id = 'firefox-old';
         for (var i = 0; i < gecko_versions.length; i++) {
           if (ua.indexOf("rv:" + gecko_versions[i]) != -1) {