Make it possible to build without enable_supervised_users.

chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc

Index: chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc
diff --git a/chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc b/chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc
index bdc276f4b7c4dc3ad36599dd06c81b435376af8c..3d8bb0c97f2877ac7d4fad3d8844c3c46bf21f09 100644
--- a/chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc
+++ b/chrome/browser/ntp_tiles/chrome_most_visited_sites_factory.cc
@@ -17,21 +17,26 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/suggestions/image_decoder_impl.h"
 #include "chrome/browser/search/suggestions/suggestions_service_factory.h"
-#include "chrome/browser/supervised_user/supervised_user_service.h"
-#include "chrome/browser/supervised_user/supervised_user_service_factory.h"
-#include "chrome/browser/supervised_user/supervised_user_service_observer.h"
-#include "chrome/browser/supervised_user/supervised_user_url_filter.h"
 #include "chrome/browser/thumbnails/thumbnail_list_source.h"
+#include "chrome/common/features.h"
 #include "components/history/core/browser/top_sites.h"
 #include "components/image_fetcher/core/image_fetcher_impl.h"
 #include "components/ntp_tiles/icon_cacher_impl.h"
 #include "components/ntp_tiles/metrics.h"
 #include "components/ntp_tiles/most_visited_sites.h"
 
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
+#include "chrome/browser/supervised_user/supervised_user_service.h"
+#include "chrome/browser/supervised_user/supervised_user_service_factory.h"
+#include "chrome/browser/supervised_user/supervised_user_service_observer.h"
+#include "chrome/browser/supervised_user/supervised_user_url_filter.h"
+#endif
+
 using suggestions::SuggestionsServiceFactory;
 
 namespace {
 
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
 class SupervisorBridge : public ntp_tiles::MostVisitedSitesSupervisor,
                          public SupervisedUserServiceObserver {
  public:
@@ -103,6 +108,7 @@ void SupervisorBridge::OnURLFilterChanged() {
     supervisor_observer_->OnBlockedSitesChanged();
   }
 }
+#endif  // BUILDFLAG(ENABLE_SUPERVISED_USERS)
 
 }  // namespace
 
@@ -129,5 +135,10 @@ ChromeMostVisitedSitesFactory::NewForProfile(Profile* profile) {
           base::MakeUnique<image_fetcher::ImageFetcherImpl>(
               base::MakeUnique<suggestions::ImageDecoderImpl>(),
               profile->GetRequestContext())),
-      base::MakeUnique<SupervisorBridge>(profile));
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
+      base::MakeUnique<SupervisorBridge>(profile)
+#else
+      nullptr
+#endif
+          );
 }