Move enable extensions define to a build flag.

chrome/browser/ui/webui/policy_ui_handler.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_UI_WEBUI_POLICY_UI_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_POLICY_UI_HANDLER_H_
 
 #include <stddef.h>
 #include <string.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/policy/core/browser/policy_error_map.h"
 #include "components/policy/core/common/policy_map.h"
 #include "components/policy/core/common/policy_namespace.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/policy/core/common/schema_registry.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "content/public/browser/web_ui_message_handler.h"
+#include "extensions/features/features.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "extensions/browser/extension_registry_observer.h"
 #endif
 
 struct PolicyStringMap {
   const char* key;
   int string_id;
 };
 
 class CloudPolicyStatusProvider;
 
 // The JavaScript message handler for the chrome://policy page.
 class PolicyUIHandler : public content::WebUIMessageHandler,
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
                         public extensions::ExtensionRegistryObserver,
 #endif
                         public policy::PolicyService::Observer,
                         public policy::SchemaRegistry::Observer {
  public:
   PolicyUIHandler();
   ~PolicyUIHandler() override;
 
 
   static void AddLocalizedPolicyStrings(content::WebUIDataSource* source,
                                         const PolicyStringMap* strings,
                                         size_t count);
 
   static void AddCommonLocalizedStringsToSource(
       content::WebUIDataSource* source);
 
   // content::WebUIMessageHandler implementation.
   void RegisterMessages() override;
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   // extensions::ExtensionRegistryObserver implementation.
   void OnExtensionLoaded(content::BrowserContext* browser_context,
                          const extensions::Extension* extension) override;
   void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
       extensions::UnloadedExtensionInfo::Reason reason) override;
 #endif
 
   // policy::PolicyService::Observer implementation.
@@ skipping 44 matching lines @@
   // the platform (Chrome OS / desktop) and type of policy that is in effect.
   std::unique_ptr<CloudPolicyStatusProvider> user_status_provider_;
   std::unique_ptr<CloudPolicyStatusProvider> device_status_provider_;
 
   base::WeakPtrFactory<PolicyUIHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyUIHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_POLICY_UI_HANDLER_H_