Move session service and supervised users to buildflags.

chrome/browser/profiles/profile_info_cache.cc

Index: chrome/browser/profiles/profile_info_cache.cc
diff --git a/chrome/browser/profiles/profile_info_cache.cc b/chrome/browser/profiles/profile_info_cache.cc
index dcd2ed2a2602336ea46950eef976bcc11326b823..fad9b363d58cb15b603448fb2c3d6e6215bac41b 100644
--- a/chrome/browser/profiles/profile_info_cache.cc
+++ b/chrome/browser/profiles/profile_info_cache.cc
@@ -22,6 +22,7 @@
 #include "chrome/browser/profiles/profile_avatar_downloader.h"
 #include "chrome/browser/profiles/profile_avatar_icon_util.h"
 #include "chrome/browser/profiles/profiles_state.h"
+#include "chrome/common/features.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/prefs/pref_registry_simple.h"
@@ -34,7 +35,7 @@
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_util.h"
 
-#if defined(ENABLE_SUPERVISED_USERS)
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
 #include "chrome/browser/supervised_user/supervised_user_constants.h"
 #endif
 
@@ -400,7 +401,7 @@ bool ProfileInfoCache::ProfileIsSupervisedAtIndex(size_t index) const {
 }
 
 bool ProfileInfoCache::ProfileIsChildAtIndex(size_t index) const {
-#if defined(ENABLE_SUPERVISED_USERS)
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
   return GetSupervisedUserIdOfProfileAtIndex(index) ==
       supervised_users::kChildAccountSUID;
 #else