Add initial Controller to DownloadService

components/download/internal/test/mock_client.cc

 // Copyright 2017 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/download/internal/entry.h"
+#include "components/download/internal/test/mock_client.h"
 
 namespace download {
+namespace test {
 
-Entry::Entry() = default;
-Entry::Entry(const Entry& other) = default;
-Entry::~Entry() = default;
+MockClient::MockClient() = default;
+MockClient::~MockClient() = default;
 
+}  // namespace test
 }  // namespace download