Move enable extensions define to a build flag.

chrome/browser/browsing_data/browsing_data_file_system_helper.cc

Index: chrome/browser/browsing_data/browsing_data_file_system_helper.cc
diff --git a/chrome/browser/browsing_data/browsing_data_file_system_helper.cc b/chrome/browser/browsing_data/browsing_data_file_system_helper.cc
index 85487b60ba2cca8fcb26ca412be08e36c61e0b6c..fc9e24509a7dafadaca43624ec9567ded4d171c8 100644
--- a/chrome/browser/browsing_data/browsing_data_file_system_helper.cc
+++ b/chrome/browser/browsing_data/browsing_data_file_system_helper.cc
@@ -13,6 +13,7 @@
 #include "base/sequenced_task_runner.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "content/public/browser/browser_thread.h"
+#include "extensions/features/features.h"
 #include "storage/browser/fileapi/file_system_context.h"
 #include "storage/browser/fileapi/file_system_quota_util.h"
 #include "storage/common/fileapi/file_system_types.h"
@@ -99,7 +100,7 @@ void BrowsingDataFileSystemHelperImpl::FetchFileSystemInfoInFileThread(
   const storage::FileSystemType types[] = {
     storage::kFileSystemTypeTemporary,
     storage::kFileSystemTypePersistent,
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
     storage::kFileSystemTypeSyncable,
 #endif
   };