Move session service and supervised users to buildflags.

chrome/browser/profiles/profile_manager.h

Index: chrome/browser/profiles/profile_manager.h
diff --git a/chrome/browser/profiles/profile_manager.h b/chrome/browser/profiles/profile_manager.h
index ba156c563e3b4c63dcfcf42a252a80d3a837f9bc..f7153701bb57e263915d35a967715d298ac5874f 100644
--- a/chrome/browser/profiles/profile_manager.h
+++ b/chrome/browser/profiles/profile_manager.h
@@ -25,6 +25,7 @@
 #include "chrome/browser/profiles/profile_metrics.h"
 #include "chrome/browser/profiles/profile_shortcut_manager.h"
 #include "chrome/browser/ui/browser_list_observer.h"
+#include "chrome/common/features.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
@@ -42,7 +43,7 @@ class ProfileManager : public base::NonThreadSafe,
   explicit ProfileManager(const base::FilePath& user_data_dir);
   ~ProfileManager() override;
 
-#if defined(ENABLE_SESSION_SERVICE)
+#if BUILDFLAG(ENABLE_SESSION_SERVICE)
   // Invokes SessionServiceFactory::ShutdownForProfile() for all profiles.
   static void ShutdownSessionServices();
 #endif