[MD History] Disable MD History for supervised users.

chrome/browser/ui/webui/md_history_ui.h

Index: chrome/browser/ui/webui/md_history_ui.h
diff --git a/chrome/browser/ui/webui/md_history_ui.h b/chrome/browser/ui/webui/md_history_ui.h
index 83ae7424bae5a9257bb53e66402ae8fbfed8bd57..3104037286d13d67186d4f9365c5dc108be1ce91 100644
--- a/chrome/browser/ui/webui/md_history_ui.h
+++ b/chrome/browser/ui/webui/md_history_ui.h
@@ -9,6 +9,8 @@
 #include "content/public/browser/web_ui_controller.h"
 #include "ui/base/layout.h"
 
+class Profile;
+
 namespace base {
 class RefCountedMemory;
 }
@@ -18,6 +20,8 @@ class MdHistoryUI : public content::WebUIController {
   explicit MdHistoryUI(content::WebUI* web_ui);
   ~MdHistoryUI() override;
 
+  static bool IsEnabled(Profile* profile);
+
   static base::RefCountedMemory* GetFaviconResourceBytes(
       ui::ScaleFactor scale_factor);