[ios Mojo] Implemented chrome://version.

ios/chrome/browser/ui/webui/version_ui.h

 // Copyright 2015 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_VERSION_UI_H_
 #define IOS_CHROME_BROWSER_UI_WEBUI_VERSION_UI_H_
 
-#include <string>
+#include <memory>
 
 #include "base/macros.h"
-#include "ios/web/public/webui/web_ui_ios_controller.h"
+#include "components/version_ui/version.mojom.h"
+#import "ios/chrome/browser/ui/webui/mojo_web_ui_ios_controller.h"
+
+class VersionHandler;
 
 // The WebUI handler for chrome://version.
-class VersionUI : public web::WebUIIOSController {
+class VersionUI : public MojoWebUIIOSController<mojom::VersionPageHandler> {
  public:
   explicit VersionUI(web::WebUIIOS* web_ui);
   ~VersionUI() override;
 
  private:
+  // MojoWebUIIOSController overrides:
+  void BindUIHandler(
+      mojo::InterfaceRequest<mojom::VersionPageHandler> request) override;
+
+  std::unique_ptr<VersionHandler> version_handler_;
+
   DISALLOW_COPY_AND_ASSIGN(VersionUI);
 };
 
 #endif  // IOS_CHROME_BROWSER_UI_WEBUI_VERSION_UI_H_