Remove NOTIFICATION_EXTENSION_ENABLED.

chrome/browser/themes/theme_service.h

 // Copyright (c) 2012 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_THEMES_THEME_SERVICE_H_
 #define CHROME_BROWSER_THEMES_THEME_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 284 matching lines @@
 
   typedef std::map<int, NSGradient*> NSGradientMap;
   mutable NSGradientMap nsgradient_cache_;
 #endif
 
   ui::ResourceBundle& rb_;
   Profile* profile_;
 
   scoped_refptr<CustomThemeSupplier> theme_supplier_;
 
-  // The id of the theme extension which has just been installed but has not
-  // been loaded yet. The theme extension with |installed_pending_load_id_| may
-  // never be loaded if the install is due to updating a disabled theme.
-  // |pending_install_id_| should be set to |kDefaultThemeID| if there are no
-  // recently installed theme extensions
-  std::string installed_pending_load_id_;
-
   // The number of infobars currently displayed.
   int number_of_infobars_;
 
   // A cache of already-computed values for COLOR_TOOLBAR_TOP_SEPARATOR, which
   // can be expensive to compute.
   mutable SeparatorColorCache separator_color_cache_;
 
   content::NotificationRegistrar registrar_;
 
   std::unique_ptr<ThemeSyncableService> theme_syncable_service_;
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   class ThemeObserver;
   std::unique_ptr<ThemeObserver> theme_observer_;
 #endif
 
   BrowserThemeProvider original_theme_provider_;
   BrowserThemeProvider incognito_theme_provider_;
 
   base::WeakPtrFactory<ThemeService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThemeService);
 };
 
 #endif  // CHROME_BROWSER_THEMES_THEME_SERVICE_H_