Move enable extensions define to a build flag.

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>
 #include <string>
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "build/build_config.h"
 #include "chrome/common/features.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "extensions/features/features.h"
 #include "ui/base/theme_provider.h"
 
 class CustomThemeSupplier;
 class BrowserThemePack;
 class ThemeSyncableService;
 class Profile;
 
 namespace base {
 class FilePath;
 }
@@ skipping 279 matching lines @@
   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 defined(ENABLE_EXTENSIONS)
+#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_