Move sandboxed_unpacker.{h,cc} from chrome/ to extensions/

extensions/test/test_content_utility_client.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 EXTENSIONS_TEST_TEST_CONTENT_UTILITY_CLIENT_H_
+#define EXTENSIONS_TEST_TEST_CONTENT_UTILITY_CLIENT_H_
+
+#include "content/public/utility/content_utility_client.h"
+#include "extensions/utility/utility_handler.h"
+
+namespace extensions {
+
+class TestContentUtilityClient : public content::ContentUtilityClient {
+ public:
+  TestContentUtilityClient();
+  ~TestContentUtilityClient() override;
+
+  // ContentUtilityClient implementation
+  void UtilityThreadStarted() override;
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+ private:
+  UtilityHandler utility_handler_;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_TEST_TEST_CONTENT_UTILITY_CLIENT_H_