Introduce TranslateService and TranslateDownloadManager

components/translate/core/browser/translate_download_manager.cc

Index: components/translate/core/browser/translate_download_manager.cc
diff --git a/components/translate/core/browser/translate_download_manager.cc b/components/translate/core/browser/translate_download_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c688d2177ea29870eefae36780b34e9a02fa845b
--- /dev/null
+++ b/components/translate/core/browser/translate_download_manager.cc
@@ -0,0 +1,16 @@
+// Copyright 2014 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 "components/translate/core/browser/translate_download_manager.h"
+
+#include "base/memory/singleton.h"
+
+// static
+TranslateDownloadManager* TranslateDownloadManager::GetInstance() {
+  return Singleton<TranslateDownloadManager>::get();
+}
+
+TranslateDownloadManager::TranslateDownloadManager() {}
+
+TranslateDownloadManager::~TranslateDownloadManager() {}