Convert utility process extension Unpacker IPC to mojo

extensions/test/test_content_browser_client.cc

Index: extensions/test/test_content_browser_client.cc
diff --git a/extensions/test/test_content_browser_client.cc b/extensions/test/test_content_browser_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4b83f11433350965071d8e793fa4b30170a70c75
--- /dev/null
+++ b/extensions/test/test_content_browser_client.cc
@@ -0,0 +1,37 @@
+// 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 "extensions/test/test_content_browser_client.h"
+
+#include "base/files/file_util.h"
+#include "base/json/json_reader.h"
+#include "base/path_service.h"
+#include "base/values.h"
+#include "content/public/common/service_names.mojom.h"
+#include "extensions/common/extension_paths.h"
+
+namespace extensions {
+
+TestContentBrowserClient::TestContentBrowserClient() = default;
+
+TestContentBrowserClient::~TestContentBrowserClient() = default;
+
+std::unique_ptr<base::Value>
+TestContentBrowserClient::GetServiceManifestOverlay(base::StringPiece name) {
+  if (name != content::mojom::kUtilityServiceName)
+    return nullptr;
+
+  base::FilePath extensions_test_data_dir;
+  CHECK(base::PathService::Get(DIR_TEST_DATA, &extensions_test_data_dir));
+
+  std::string contents;
+  CHECK(base::ReadFileToString(
+      extensions_test_data_dir.AppendASCII(
+          "extensions_test_content_utility_manifest_overlay.json"),
+      &contents));
+
+  return base::JSONReader::Read(contents);
+}
+
+}  // namespace extensions