Remove some unused history resources on iOS

ios/chrome/browser/ui/webui/history/history_ui.h

Index: ios/chrome/browser/ui/webui/history/history_ui.h
diff --git a/ios/chrome/browser/ui/webui/history/history_ui.h b/ios/chrome/browser/ui/webui/history/history_ui.h
deleted file mode 100644
index eeb81a8622dcd6344bd69e6413cd35a75c8c7a15..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/webui/history/history_ui.h
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef IOS_CHROME_BROWSER_UI_WEBUI_HISTORY_HISTORY_UI_H_
-#define IOS_CHROME_BROWSER_UI_WEBUI_HISTORY_HISTORY_UI_H_
-
-#include "base/macros.h"
-#include "ios/web/public/webui/web_ui_ios_controller.h"
-#include "ui/base/layout.h"
-
-namespace base {
-class RefCountedMemory;
-}
-
-namespace web {
-class WebUIIOS;
-}
-
-class HistoryUI : public web::WebUIIOSController {
- public:
-  explicit HistoryUI(web::WebUIIOS* web_ui);
-  ~HistoryUI() override;
-
-  static base::RefCountedMemory* GetFaviconResourceBytes(
-      ui::ScaleFactor scale_factor);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(HistoryUI);
-};
-
-#endif  // IOS_CHROME_BROWSER_UI_WEBUI_HISTORY_HISTORY_UI_H_