Move session service and supervised users to buildflags.

chrome/browser/profiles/profile_io_data.h

Index: chrome/browser/profiles/profile_io_data.h
diff --git a/chrome/browser/profiles/profile_io_data.h b/chrome/browser/profiles/profile_io_data.h
index c427a7a3868a4e2b23d459ba4b7bd8ccab3cfac3..33e601110bfa689928c91619d20e22d1bc33f7ba 100644
--- a/chrome/browser/profiles/profile_io_data.h
+++ b/chrome/browser/profiles/profile_io_data.h
@@ -24,6 +24,7 @@
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/storage_partition_descriptor.h"
+#include "chrome/common/features.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/policy/core/browser/url_blacklist_manager.h"
 #include "components/prefs/pref_member.h"
@@ -226,7 +227,7 @@ class ProfileIOData {
     return policy_header_helper_.get();
   }
 
-#if defined(ENABLE_SUPERVISED_USERS)
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
   const SupervisedUserURLFilter* supervised_user_url_filter() const {
     return supervised_user_url_filter_.get();
   }
@@ -340,7 +341,7 @@ class ProfileIOData {
     // and needs to be on the main thread.
     std::unique_ptr<net::ProxyConfigService> proxy_config_service;
 
-#if defined(ENABLE_SUPERVISED_USERS)
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
     scoped_refptr<const SupervisedUserURLFilter> supervised_user_url_filter;
 #endif
 
@@ -614,7 +615,7 @@ class ProfileIOData {
   mutable std::unique_ptr<ChromeHttpUserAgentSettings>
       chrome_http_user_agent_settings_;
 
-#if defined(ENABLE_SUPERVISED_USERS)
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
   mutable scoped_refptr<const SupervisedUserURLFilter>
       supervised_user_url_filter_;
 #endif