Move enable extensions define to a build flag.

chrome/browser/renderer_context_menu/render_view_context_menu.h

Index: chrome/browser/renderer_context_menu/render_view_context_menu.h
diff --git a/chrome/browser/renderer_context_menu/render_view_context_menu.h b/chrome/browser/renderer_context_menu/render_view_context_menu.h
index 731dde5ca0e1b185ca73610dc26286fcd9dbcb90..302cf17462d24c97103eefdc74579887760684e4 100644
--- a/chrome/browser/renderer_context_menu/render_view_context_menu.h
+++ b/chrome/browser/renderer_context_menu/render_view_context_menu.h
@@ -20,12 +20,13 @@
 #include "components/renderer_context_menu/render_view_context_menu_observer.h"
 #include "components/renderer_context_menu/render_view_context_menu_proxy.h"
 #include "content/public/common/context_menu_params.h"
+#include "extensions/features/features.h"
 #include "printing/features/features.h"
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/geometry/vector2d.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/context_menu_matcher.h"
 #include "chrome/browser/extensions/menu_manager.h"
 #endif
@@ -89,7 +90,7 @@ class RenderViewContextMenu : public RenderViewContextMenuBase {
   // Helper function to escape "&" as "&&".
   void EscapeAmpersands(base::string16* text);
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   extensions::ContextMenuMatcher extension_items_;
 #endif
   void RecordUsedItem(int id) override;
@@ -104,7 +105,7 @@ class RenderViewContextMenu : public RenderViewContextMenuBase {
 
   static bool IsDevToolsURL(const GURL& url);
   static bool IsInternalResourcesURL(const GURL& url);
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   static bool ExtensionContextAndPatternMatch(
       const content::ContextMenuParams& params,
       const extensions::MenuItem::ContextList& contexts,
@@ -146,7 +147,7 @@ class RenderViewContextMenu : public RenderViewContextMenuBase {
   void AppendLanguageSettings();
   void AppendSpellingSuggestionItems();
   void AppendSearchProvider();
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   void AppendAllExtensionItems();
   void AppendCurrentExtensionItems();
 #endif