Move enable extensions define to a build flag.

chrome/browser/supervised_user/supervised_user_service.cc

Index: chrome/browser/supervised_user/supervised_user_service.cc
diff --git a/chrome/browser/supervised_user/supervised_user_service.cc b/chrome/browser/supervised_user/supervised_user_service.cc
index 68d04894ce2e5bb0c327f6efe719dcb4bd8d6eac..724097ef6061a54c6becde404385fc67a3b23b30 100644
--- a/chrome/browser/supervised_user/supervised_user_service.cc
+++ b/chrome/browser/supervised_user/supervised_user_service.cc
@@ -51,6 +51,7 @@
 #include "components/signin/core/common/signin_switches.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/user_metrics.h"
+#include "extensions/features/features.h"
 #include "ui/base/l10n/l10n_util.h"
 
 #if !defined(OS_ANDROID)
@@ -69,7 +70,7 @@
 #include "components/user_manager/user_manager.h"
 #endif
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "extensions/browser/extension_prefs.h"
@@ -86,14 +87,14 @@ using base::DictionaryValue;
 using base::UserMetricsAction;
 using content::BrowserThread;
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 using extensions::Extension;
 using extensions::ExtensionPrefs;
 using extensions::ExtensionRegistry;
 using extensions::ExtensionSystem;
 #endif
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 using extensions::ExtensionPrefs;
 #endif
 
@@ -537,12 +538,12 @@ SupervisedUserService::SupervisedUserService(Profile* profile)
       did_init_(false),
       did_shutdown_(false),
       blacklist_state_(BlacklistLoadState::NOT_LOADED),
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
       registry_observer_(this),
 #endif
       weak_ptr_factory_(this) {
   url_filter_context_.ui_url_filter()->AddObserver(this);
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   registry_observer_.Add(extensions::ExtensionRegistry::Get(profile));
 #endif
 }
@@ -600,7 +601,7 @@ void SupervisedUserService::SetActive(bool active) {
 
   GetSettingsService()->SetActive(active_);
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   SetExtensionsActive();
 #endif
 
@@ -609,7 +610,7 @@ void SupervisedUserService::SetActive(bool active) {
         prefs::kDefaultSupervisedUserFilteringBehavior,
         base::Bind(&SupervisedUserService::OnDefaultFilteringBehaviorChanged,
             base::Unretained(this)));
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
     pref_change_registrar_.Add(
         prefs::kSupervisedUserApprovedExtensions,
         base::Bind(&SupervisedUserService::UpdateApprovedExtensions,
@@ -637,7 +638,7 @@ void SupervisedUserService::SetActive(bool active) {
     UpdateManualHosts();
     UpdateManualURLs();
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
     UpdateApprovedExtensions();
 #endif
 
@@ -652,7 +653,7 @@ void SupervisedUserService::SetActive(bool active) {
 
     pref_change_registrar_.Remove(
         prefs::kDefaultSupervisedUserFilteringBehavior);
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
     pref_change_registrar_.Remove(prefs::kSupervisedUserApprovedExtensions);
 #endif
     pref_change_registrar_.Remove(prefs::kSupervisedUserManualHosts);
@@ -990,7 +991,7 @@ void SupervisedUserService::Shutdown() {
     sync_service->RemovePreferenceProvider(this);
 }
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 SupervisedUserService::ExtensionState SupervisedUserService::GetExtensionState(
     const Extension& extension) const {
   bool was_installed_by_default = extension.was_installed_by_default();
@@ -1240,7 +1241,7 @@ void SupervisedUserService::SetExtensionsActive() {
     extension_system->extension_service()->CheckManagementPolicy();
   }
 }
-#endif  // defined(ENABLE_EXTENSIONS)
+#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
 
 syncer::ModelTypeSet SupervisedUserService::GetPreferredDataTypes() const {
   if (!ProfileIsSupervised())