Add LanguageModel, a keyed service that collects language info from CLD.

chrome/browser/translate/chrome_translate_client.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_
 #define CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/ui/translate/translate_bubble_model.h"
 #include "components/translate/content/browser/content_translate_driver.h"
+#include "components/translate/content/browser/language_model_observer.h"
 #include "components/translate/core/browser/translate_client.h"
 #include "components/translate/core/browser/translate_step.h"
 #include "components/translate/core/common/translate_errors.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }  // namespace content
@@ skipping 89 matching lines @@
   friend class content::WebContentsUserData<ChromeTranslateClient>;
 
   // content::WebContentsObserver implementation.
   void WebContentsDestroyed() override;
 
   // Shows the translate bubble.
   void ShowBubble(translate::TranslateStep step,
                   translate::TranslateErrors::Type error_type);
 
   translate::ContentTranslateDriver translate_driver_;
+  translate::LanguageModelObserver language_model_observer_;
   std::unique_ptr<translate::TranslateManager> translate_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeTranslateClient);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_