The translate feature was only translating the main frame of the page....

chrome/renderer/navigation_state.h

Index: chrome/renderer/navigation_state.h
===================================================================
--- chrome/renderer/navigation_state.h	(revision 38414)
+++ chrome/renderer/navigation_state.h	(working copy)
@@ -211,6 +211,10 @@
   void set_was_fetched_via_spdy(bool value) { was_fetched_via_spdy_ = value; }
   bool was_fetched_via_spdy() const { return was_fetched_via_spdy_; }
 
+  // Whether the frame text contents was translated to a different language.
+  void set_was_translated(bool value) { was_translated_ = value; }
+  bool was_translated() const { return was_translated_; }
+
  private:
   NavigationState(PageTransition::Type transition_type,
                   const base::Time& request_time,
@@ -227,7 +231,8 @@
         cache_policy_override_set_(false),
         cache_policy_override_(WebKit::WebURLRequest::UseProtocolCachePolicy),
         user_script_idle_scheduler_(NULL),
-        was_fetched_via_spdy_(false) {
+        was_fetched_via_spdy_(false),
+        was_translated_(false) {
   }
 
   PageTransition::Type transition_type_;
@@ -258,6 +263,8 @@
 
   bool was_fetched_via_spdy_;
 
+  bool was_translated_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigationState);
 };