Fix a crash caused by unknown saved language.

chrome/browser/translate/translate_manager.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/translate/translate_manager.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/json/json_reader.h"
 #include "base/memory/singleton.h"
@@ skipping 471 matching lines @@
   }
 
   // If the user has previously selected "always translate" for this language we
   // automatically translate.  Note that in incognito mode we disable that
   // feature; the user will get an infobar, so they can control whether the
   // page's text is sent to the translate server.
   std::string auto_target_lang;
   if (!tab->browser_context()->IsOffTheRecord() &&
       TranslatePrefs::ShouldAutoTranslate(prefs, language_code,
           &auto_target_lang)) {
-    TranslatePage(tab, language_code, auto_target_lang);
-    return;
+    // We need to confirm that the saved target language is still supported.
+    // Also, GetLanguageCode will take care of removing country code if any.
+    auto_target_lang = GetLanguageCode(auto_target_lang);
+    if (IsSupportedLanguage(auto_target_lang)) {
+      TranslatePage(tab, language_code, auto_target_lang);
+      return;
+    }
   }
 
   TabContentsWrapper* wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(tab);
   if (!wrapper || !wrapper->translate_tab_helper())
     return;
 
   TranslateTabHelper* helper = wrapper->translate_tab_helper();
   std::string auto_translate_to = helper->language_state().AutoTranslateTo();
   if (!auto_translate_to.empty()) {
@@ skipping 294 matching lines @@
     return NULL;
 
   for (size_t i = 0; i < wrapper->infobar_count(); ++i) {
     TranslateInfoBarDelegate* delegate =
         wrapper->GetInfoBarDelegateAt(i)->AsTranslateInfoBarDelegate();
     if (delegate)
       return delegate;
   }
   return NULL;
 }