MD Bookmarks: Disable 'Open in Incognito Window' when Incognito is disabled

chrome/browser/resources/md_bookmarks/constants.js

Index: chrome/browser/resources/md_bookmarks/constants.js
diff --git a/chrome/browser/resources/md_bookmarks/constants.js b/chrome/browser/resources/md_bookmarks/constants.js
index bcbee2b931dd12951a77f6b826df139e5251e09d..ef09b031e5d087bc22561dc7105c017e743eb4c8 100644
--- a/chrome/browser/resources/md_bookmarks/constants.js
+++ b/chrome/browser/resources/md_bookmarks/constants.js
@@ -30,6 +30,17 @@ var Command = {
   OPEN: 'open',
 };
 
+/**
+ * Mirrors the C++ enum from IncognitoModePrefs.
+ * @enum {number}
+ * @const
+ */
+var IncognitoAvailability = {
+  ENABLED: 0,
+  DISABLED: 1,
+  FORCED: 2,
+};
+
 /** @const */
 var LOCAL_STORAGE_CLOSED_FOLDERS_KEY = 'closedState';