Relanding the language detection.

chrome/browser/extensions/extension_tabs_module.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
@@ skipping 113 matching lines @@
 };
 class DetectTabLanguageFunction : public AsyncExtensionFunction,
                                   public NotificationObserver {
  private:
   ~DetectTabLanguageFunction() {}
   virtual bool RunImpl();
 
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
+  void GotLanguage(const std::string& language);
   NotificationRegistrar registrar_;
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.detectLanguage")
 };
 class CaptureVisibleTabFunction : public SyncExtensionFunction {
   ~CaptureVisibleTabFunction() {}
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.captureVisibleTab")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__