allow unit_tests to re-create service manager context.

content/browser/child_process_launcher_helper_mac.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 "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #include "base/posix/global_descriptors.h"
 #include "content/browser/bootstrap_sandbox_manager_mac.h"
 #include "content/browser/child_process_launcher.h"
 #include "content/browser/child_process_launcher_helper.h"
@@ skipping 140 matching lines @@
 
 // static
 void ChildProcessLauncherHelper::SetRegisteredFilesForService(
     const std::string& service_name,
     catalog::RequiredFileMap required_files) {
   // No file passing from the manifest on Mac yet.
   DCHECK(required_files.empty());
 }
 
 // static
+void ChildProcessLauncherHelper::ResetRegisteredFilesForTesting() {}
+
+// static
 base::File OpenFileToShare(const base::FilePath& path,
                            base::MemoryMappedFile::Region* region) {
   // Not used yet (until required files are described in the service manifest on
   // Mac).
   NOTREACHED();
   return base::File();
 }
 
 }  //  namespace internal
 }  // namespace content