[ios Mojo] Implemented chrome://version.

ios/chrome/browser/ui/webui/version_handler.cc

 // 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.
 
 #include "ios/chrome/browser/ui/webui/version_handler.h"
 
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/values.h"
 #include "components/version_ui/version_handler_helper.h"
 #include "components/version_ui/version_ui_constants.h"
 #include "ios/web/public/webui/web_ui_ios.h"
 #include "ui/base/l10n/l10n_util.h"
 
-VersionHandler::VersionHandler() {}
+VersionHandler::VersionHandler(
+    mojo::InterfaceRequest<mojom::VersionPageHandler> request)
+    : binding_(this, std::move(request)) {}
 
 VersionHandler::~VersionHandler() {}
 
-void VersionHandler::RegisterMessages() {
-  web_ui()->RegisterMessageCallback(
-      version_ui::kRequestVersionInfo,
-      base::Bind(&VersionHandler::HandleRequestVersionInfo,
-                 base::Unretained(this)));
+void VersionHandler::GetFilePaths(const GetFilePathsCallback& callback) {
+  NOTREACHED();
 }
 
-void VersionHandler::HandleRequestVersionInfo(const base::ListValue* args) {
-  // Respond with the variations info immediately.
-  web_ui()->CallJavascriptFunction(version_ui::kReturnVariationInfo,
-                                   *version_ui::GetVariationsList());
+void VersionHandler::GetFlashVersion(const GetFlashVersionCallback& callback) {
+  NOTREACHED();
 }
+
+void VersionHandler::GetVariations(const GetVariationsCallback& callback) {
+  std::vector<std::string> variations = version_ui::GetVariations();
+  callback.Run(mojo::Array<mojo::String>::From(variations));
+}
+
+void VersionHandler::GetOsVersion(const GetOsVersionCallback& callback) {
+  NOTREACHED();
+}
+
+void VersionHandler::GetArcVersion(const GetArcVersionCallback& callback) {
+  NOTREACHED();
+}