Move enable extensions define to a build flag.

chrome/browser/ui/webui/log_web_ui_url_browsertest.cc

Index: chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
diff --git a/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc b/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
index f5f9dbc20625e94187231f0b92c327fd95e31d05..9d754a1b137a1115b1176b4815ec7613bc449f02 100644
--- a/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
+++ b/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
@@ -22,6 +22,7 @@
 #include "components/strings/grit/components_strings.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/browser_test_utils.h"
+#include "extensions/features/features.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "url/gurl.h"
@@ -64,7 +65,7 @@ IN_PROC_BROWSER_TEST_F(LogWebUIUrlTest, TestHistoryFrame) {
   EXPECT_THAT(GetSamples(), ElementsAre(Bucket(history_frame_url_hash, 2)));
 }
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 IN_PROC_BROWSER_TEST_F(LogWebUIUrlTest, TestUberPage) {
   content::WebContents* tab =
       browser()->tab_strip_model()->GetActiveWebContents();