Move enable extensions define to a build flag.

chrome/browser/browsing_data/browsing_data_helper_unittest.cc

Index: chrome/browser/browsing_data/browsing_data_helper_unittest.cc
diff --git a/chrome/browser/browsing_data/browsing_data_helper_unittest.cc b/chrome/browser/browsing_data/browsing_data_helper_unittest.cc
index 2d4eb08c755241a8c9fb526195a64a9e31c7e296..77ee686f4efe5749724d3eb1fa21236eeaeb1fac 100644
--- a/chrome/browser/browsing_data/browsing_data_helper_unittest.cc
+++ b/chrome/browser/browsing_data/browsing_data_helper_unittest.cc
@@ -8,11 +8,12 @@
 #include "base/strings/stringprintf.h"
 #include "chrome/common/url_constants.h"
 #include "extensions/common/constants.h"
+#include "extensions/features/features.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 #include "url/url_constants.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/mock_extension_special_storage_policy.h"
 #endif
 
@@ -104,7 +105,7 @@ TEST_F(BrowsingDataHelperTest, ChromeSchemesAreNotAllExtension) {
   EXPECT_FALSE(IsExtensionScheme(content::kViewSourceScheme));
 }
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 TEST_F(BrowsingDataHelperTest, TestMatches) {
   scoped_refptr<MockExtensionSpecialStoragePolicy> mock_policy =
       new MockExtensionSpecialStoragePolicy;