Improve process launch handle sharing API.

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"
 #include "base/files/memory_mapped_file.h"
 #include "services/catalog/public/cpp/manifest_parsing_util.h"
 
 namespace base {
 class CommandLine;
 class FilePath;
 }  // namespace base
 
 namespace mojo {
 namespace edk {
 struct PlatformHandle;
 }  // namespace mojo
 }  // namespace edk
 
 // Contains the common functionalities between the various POSIX child process
 // launcher implementations.
 
 namespace content {
 
-class FileDescriptorInfo;
+class PosixFileDescriptorInfo;
 
 namespace internal {
 
-std::unique_ptr<FileDescriptorInfo> CreateDefaultPosixFilesToMap(
+std::unique_ptr<PosixFileDescriptorInfo> CreateDefaultPosixFilesToMap(
     int child_process_id,
     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_