Move enable extensions define to a build flag.

chrome/browser/browsing_data/browsing_data_remover.cc

Index: chrome/browser/browsing_data/browsing_data_remover.cc
diff --git a/chrome/browser/browsing_data/browsing_data_remover.cc b/chrome/browser/browsing_data/browsing_data_remover.cc
index 8249f3231fe29fa2d11b6f1508e93bb6219d9b00..8fe00d5e7f6000aaef5c6d674260df2696d302d3 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.cc
+++ b/chrome/browser/browsing_data/browsing_data_remover.cc
@@ -79,6 +79,7 @@
 #include "content/public/browser/ssl_host_state_delegate.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/user_metrics.h"
+#include "extensions/features/features.h"
 #include "net/base/net_errors.h"
 #include "net/cookies/cookie_store.h"
 #include "net/http/http_network_session.h"
@@ -100,7 +101,7 @@
 #include "components/precache/content/precache_manager.h"
 #endif
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/activity_log/activity_log.h"
 #include "extensions/browser/extension_prefs.h"
 #endif
@@ -534,7 +535,7 @@ void BrowsingDataRemover::RemoveImpl(
                                                 filter);
     }
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
     // The extension activity log contains details of which websites extensions
     // were active on. It therefore indirectly stores details of websites a
     // user has visited so best clean from here as well.