Always enable enhanced bookmarks external component extensions for incognito mode

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 5159162fde6450e19efb907f8514f927504aca13..82df86b1471151f16070f43140e91bdf1c363860 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -540,6 +540,12 @@ class ExtensionService
       const extensions::ExtensionIdSet& unchanged,
       const extensions::Blacklist::BlacklistStateMap& state_map);
 
+  // Helper to determine if the the extension should be enabled by default for
+  // incognito mode. This is permitted for selected external component
+  // extensions. (Internal component extensions are enabled in incognito by
+  // default.)
+  static bool ShouldEnableForIncognito(const extensions::Extension* extension);
+
   // Used only by test code.
   void UnloadAllExtensionsInternal();