Revert "Automatically trigger installation of high-quality speech synthesis extension."

chrome/browser/extensions/external_component_loader.h

 // Copyright (c) 2013 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_EXTERNAL_COMPONENT_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
-#include "base/containers/hash_tables.h"
-#include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/external_loader.h"
 #include "chrome/browser/profiles/profile.h"
 
-class PrefChangeRegistrar;
-
 namespace extensions {
 
 // A specialization of the ExternalLoader that loads a hard-coded list of
 // external extensions, that should be considered components of chrome (but
 // unlike Component extensions, these extensions are installed from the webstore
 // and don't get access to component only APIs.
 // Instances of this class are expected to be created and destroyed on the UI
 // thread and they are expecting public method calls from the UI thread.
-class ExternalComponentLoader
-    : public ExternalLoader,
-      public base::SupportsWeakPtr<ExternalComponentLoader> {
+class ExternalComponentLoader : public ExternalLoader {
  public:
   explicit ExternalComponentLoader(Profile* profile);
 
   static bool IsEnhancedBookmarksExperimentEnabled();
 
-  // Register speech synthesis prefs for a profile.
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
  protected:
   virtual void StartLoading() OVERRIDE;
 
  private:
   friend class base::RefCountedThreadSafe<ExternalLoader>;
   virtual ~ExternalComponentLoader();
 
   // The profile that this loader is associated with. It listens for
   // preference changes for that profile.
   Profile* profile_;
-
-#if defined(OS_CHROMEOS)
-  // The pref change registrar, so we can watch for pref changes.
-  scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
-
-  // A map from language code to the extension id of the high-quality
-  // extension for that language in the web store, if any - for loading
-  // speech synthesis component extensions.
-  base::hash_map<std::string, std::string> lang_to_extension_id_map_;
-#endif
-
   DISALLOW_COPY_AND_ASSIGN(ExternalComponentLoader);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_COMPONENT_LOADER_H_