Add settings:: namespace to MdSettingsUi.

chrome/browser/ui/webui/md_settings_ui.h

Index: chrome/browser/ui/webui/md_settings_ui.h
diff --git a/chrome/browser/ui/webui/md_settings_ui.h b/chrome/browser/ui/webui/md_settings_ui.h
deleted file mode 100644
index 8ad796b774e3fc6a3b2a97e1f9fe2206e723aa7d..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/webui/md_settings_ui.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_MD_SETTINGS_UI_H_
-#define CHROME_BROWSER_UI_WEBUI_MD_SETTINGS_UI_H_
-
-#include "chrome/browser/ui/webui/options/core_options_handler.h"
-#include "chrome/browser/ui/webui/options/options_ui.h"
-#include "content/public/browser/web_ui_controller.h"
-
-// The WebUI handler for chrome://md-settings.
-class MdSettingsUI : public content::WebUIController,
-                     public options::OptionsPageUIHandlerHost {
- public:
-  explicit MdSettingsUI(content::WebUI* web_ui);
-  ~MdSettingsUI() override;
-
-  // OptionsPageUIHandlerHost:
-  void InitializeHandlers() override;
-
- private:
-  options::CoreOptionsHandler* core_handler_;
-
-  DISALLOW_COPY_AND_ASSIGN(MdSettingsUI);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_MD_SETTINGS_UI_H_