[ios Mojo] Implemented chrome://version.

ios/chrome/browser/ui/webui/version_handler.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_HANDLER_H_
 #define IOS_CHROME_BROWSER_UI_WEBUI_VERSION_HANDLER_H_
 
 #include "base/macros.h"
-#include "ios/web/public/webui/web_ui_ios_message_handler.h"
-
-namespace base {
-class ListValue;
-}
+#include "components/version_ui/version.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
 
 // Handler class for Version page operations.
-class VersionHandler : public web::WebUIIOSMessageHandler {
+class VersionHandler : public mojom::VersionPageHandler {
  public:
-  VersionHandler();
+  explicit VersionHandler(
+      mojo::InterfaceRequest<mojom::VersionPageHandler> request);
   ~VersionHandler() override;
 
-  // content::WebUIMessageHandler implementation.
-  void RegisterMessages() override;
-
-  // Callback for the "requestVersionInfo" message. This asynchronously requests
-  // the list of variations.
-  void HandleRequestVersionInfo(const base::ListValue* args);
+  // mojom::VersionPageHandler overrides:
+  void GetFilePaths(const GetFilePathsCallback& callback) override;
+  void GetFlashVersion(const GetFlashVersionCallback& callback) override;
+  void GetVariations(const GetVariationsCallback& callback) override;
+  void GetOsVersion(const GetOsVersionCallback& callback) override;
+  void GetArcVersion(const GetArcVersionCallback& callback) override;
 
  private:
+  mojo::Binding<mojom::VersionPageHandler> binding_;
   DISALLOW_COPY_AND_ASSIGN(VersionHandler);
 };
 
 #endif  // IOS_CHROME_BROWSER_UI_WEBUI_VERSION_HANDLER_H_