allow unit_tests to re-create service manager context.

content/browser/child_process_launcher_helper_linux.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/path_service.h"
 #include "base/posix/global_descriptors.h"
 #include "content/browser/child_process_launcher.h"
 #include "content/browser/child_process_launcher_helper.h"
 #include "content/browser/child_process_launcher_helper_posix.h"
 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
@@ skipping 134 matching lines @@
 }
 
 // static
 void ChildProcessLauncherHelper::SetRegisteredFilesForService(
     const std::string& service_name,
     catalog::RequiredFileMap required_files) {
   SetFilesToShareForServicePosix(service_name, std::move(required_files));
 }
 
 // static
+void ChildProcessLauncherHelper::ResetRegisteredFilesForTesting() {
+  ResetFilesToShareForTestingPosix();
+}
+
+// static
 base::File OpenFileToShare(const base::FilePath& path,
                            base::MemoryMappedFile::Region* region) {
   base::FilePath exe_dir;
   bool result = base::PathService::Get(base::BasePathKey::DIR_EXE, &exe_dir);
   DCHECK(result);
   base::File file(exe_dir.Append(path),
                   base::File::FLAG_OPEN | base::File::FLAG_READ);
   *region = base::MemoryMappedFile::Region::kWholeFile;
   return file;
 }
 
 }  // namespace internal
 }  // namespace content