Translate: introduce unittest for TranslateHelper

chrome/renderer/translate_helper.h

Index: chrome/renderer/translate_helper.h
diff --git a/chrome/renderer/translate_helper.h b/chrome/renderer/translate_helper.h
index 83e0cc6b36414b3e1256f213ba1148f63f069bfb..dab2006a36723740f4de75da380fb81f65714b3c 100644
--- a/chrome/renderer/translate_helper.h
+++ b/chrome/renderer/translate_helper.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/common/translate_errors.h"
 #include "content/public/renderer/render_view_observer.h"
@@ -28,9 +29,6 @@ class TranslateHelper : public content::RenderViewObserver {
   void PageCaptured(const string16& contents);
 
  protected:
-  // Convert language code to the one used in server supporting list.
-  static void ConvertLanguageCodeSynonym(std::string* code);
-
   // The following methods are protected so they can be overridden in
   // unit-tests.
   void OnTranslatePage(int page_id,
@@ -68,6 +66,11 @@ class TranslateHelper : public content::RenderViewObserver {
   virtual bool DontDelayTasks();
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(TranslateHelperTest, LanguageCodeSynonyms);
+
+  // Convert language code to the one used in server supporting list.
+  static void ConvertLanguageCodeSynonym(std::string* code);
+
   // Returns whether the page associated with |document| is a candidate for
   // translation.  Some pages can explictly specify (via a meta-tag) that they
   // should not be translated.