Check that processed i18n nodes are defined before marking them.

ui/webui/resources/js/i18n_template_no_process.js

Index: ui/webui/resources/js/i18n_template_no_process.js
diff --git a/ui/webui/resources/js/i18n_template_no_process.js b/ui/webui/resources/js/i18n_template_no_process.js
index e3bc9131928b65fff708f604121e3f79d7bb4550..38443f01b5bf868d9d9850503ed97576732a713e 100644
--- a/ui/webui/resources/js/i18n_template_no_process.js
+++ b/ui/webui/resources/js/i18n_template_no_process.js
@@ -184,8 +184,10 @@ var i18nTemplate = (function() {
 
     if (mark) {
       var processed = isElement ? [root] : root.children;

[Dan Beam, 2015/07/22 00:20:40]

fwiw: this would probably work on iOS as well

  var processed = isElement ? [root] : root.childNodes;
  for (var i = 0; i < process.length; ++i) {
    if (processed.nodeType == Node.ELEMENT_NODE)
      processed[i].setAttribute('i18n-processed', '');
  }

or just

    if (processed instanceof Element)

-      for (var i = 0; i < processed.length; ++i) {
-        processed[i].setAttribute('i18n-processed', '');
+      if (processed) {

[Dan Beam, 2015/07/21 21:26:21]

I'm confused. if ([]) always triggers.  root.children should always be there. 
when is this actually happening?

+        for (var i = 0; i < processed.length; ++i) {
+          processed[i].setAttribute('i18n-processed', '');
+        }
       }
     }
   }