Remove old webui History page on desktop and mobile

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 bc9797460c55f9e5c5a5f4869cdcacf5da3aef90..709cef0d22e7a6a57d4b308e737f7f5f8f4d0e56 100644
--- a/chrome/browser/ui/webui/md_history_ui.h
+++ b/chrome/browser/ui/webui/md_history_ui.h
@@ -8,11 +8,9 @@
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "content/public/browser/web_ui_controller.h"
-#include "ui/base/layout.h"
 
 namespace base {
 class ListValue;
-class RefCountedMemory;
 }
 
 namespace user_prefs {
@@ -26,9 +24,6 @@ class MdHistoryUI : public content::WebUIController {
 
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
-  static base::RefCountedMemory* GetFaviconResourceBytes(
-      ui::ScaleFactor scale_factor);
-
  private:
   FRIEND_TEST_ALL_PREFIXES(ContinueWhereILeftOffTest, MDHistoryUpgrade);