Move enable extensions define to a build flag.

chrome/test/base/chrome_render_view_test.h

Index: chrome/test/base/chrome_render_view_test.h
diff --git a/chrome/test/base/chrome_render_view_test.h b/chrome/test/base/chrome_render_view_test.h
index 6ee89e1bcb94f54281c86d487c4960cefcba22e8..1f1067b3c27886cd5eb5ce56dd827948924c49b5 100644
--- a/chrome/test/base/chrome_render_view_test.h
+++ b/chrome/test/base/chrome_render_view_test.h
@@ -10,6 +10,7 @@
 
 #include "chrome/renderer/chrome_mock_render_thread.h"
 #include "content/public/test/render_view_test.h"
+#include "extensions/features/features.h"
 
 class ChromeContentRendererClient;
 
@@ -53,7 +54,7 @@ class ChromeRenderViewTest : public content::RenderViewTest {
   // class.
   virtual ChromeMockRenderThread* CreateMockRenderThread();
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   std::unique_ptr<extensions::DispatcherDelegate>
       extension_dispatcher_delegate_;
 #endif