allow unit_tests to re-create service manager context.

content/browser/child_process_launcher_helper_posix.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 CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_HELPER_POSIX_H_
 #define CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_HELPER_POSIX_H_
 
 #include <memory>
 
 #include "base/files/file.h"
@@ skipping 25 matching lines @@
     const mojo::edk::PlatformHandle& mojo_client_handle,
     bool include_service_required_files,
     const std::string& process_type,
     base::CommandLine* command_line);
 
 // Called by the service manager to register the files that should be mapped for
 // a service in the child process.
 void SetFilesToShareForServicePosix(const std::string& service_name,
                                     catalog::RequiredFileMap required_files);
 
+// Called from unit_tests in order to reset all previously registered files.
+void ResetFilesToShareForTestingPosix();
+
 // Opens the file in read mode at the given path. Note that the path should be
 // relative and the way it is resolved is platform specific.
 // |region| is set to the region of the file that should be read.
 base::File OpenFileToShare(const base::FilePath& path,
                            base::MemoryMappedFile::Region* region);
 
 }  // namespace internal
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_HELPER_POSIX_H_
+#endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_HELPER_POSIX_H_