Convert utility process extension Unpacker IPC to mojo

extensions/test/test_content_browser_client.h

+// 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.
+
+#ifndef EXTENSIONS_TEST_TEST_CONTENT_BROWSER_CLIENT_H_
+#define EXTENSIONS_TEST_TEST_CONTENT_BROWSER_CLIENT_H_
+
+#include <memory>
+
+#include "base/strings/string_piece.h"
+#include "content/public/browser/content_browser_client.h"
+
+namespace base {
+class Value;
+}
+
+namespace extensions {
+
+class TestContentBrowserClient : public content::ContentBrowserClient {
+ public:
+  TestContentBrowserClient();
+  ~TestContentBrowserClient() override;
+
+  // content::ContentBrowserClient:
+  std::unique_ptr<base::Value> GetServiceManifestOverlay(
+      base::StringPiece name) override;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_TEST_TEST_CONTENT_BROWSER_CLIENT_H_