Refactor NaClProcessHost. Reduce chances to leak the resource.

components/nacl/common/nacl_types.cc

 // Copyright 2013 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 "components/nacl/common/nacl_types.h"
 #include "ipc/ipc_platform_file.h"
 
 namespace nacl {
 
 NaClStartParams::NaClStartParams()
@@ skipping 14 matching lines @@
 }
 
 NaClStartParams::~NaClStartParams() {
 }
 
 NaClResourcePrefetchResult::NaClResourcePrefetchResult()
     : file(IPC::InvalidPlatformFileForTransit()) {
 }
 
 NaClResourcePrefetchResult::NaClResourcePrefetchResult(
-    IPC::PlatformFileForTransit file,
+    const IPC::PlatformFileForTransit& file,
     const base::FilePath& file_path_metadata,
     const std::string& file_key)
     : file(file), file_path_metadata(file_path_metadata), file_key(file_key) {
 }
 
 NaClResourcePrefetchResult::~NaClResourcePrefetchResult() {
 }
 
 NaClResourcePrefetchRequest::NaClResourcePrefetchRequest() {
 }
@@ skipping 45 matching lines @@
 NaClLaunchResult::NaClLaunchResult()
     : imc_channel_handle(IPC::InvalidPlatformFileForTransit()),
       ppapi_ipc_channel_handle(),
       trusted_ipc_channel_handle(),
       plugin_pid(base::kNullProcessId),
       plugin_child_id(0),
       crash_info_shmem_handle(base::SharedMemory::NULLHandle()) {
 }
 
 NaClLaunchResult::NaClLaunchResult(
-    FileDescriptor imc_channel_handle,
+    const IPC::PlatformFileForTransit& imc_channel_handle,
     const IPC::ChannelHandle& ppapi_ipc_channel_handle,
     const IPC::ChannelHandle& trusted_ipc_channel_handle,
     const IPC::ChannelHandle& manifest_service_ipc_channel_handle,
     base::ProcessId plugin_pid,
     int plugin_child_id,
     base::SharedMemoryHandle crash_info_shmem_handle)
     : imc_channel_handle(imc_channel_handle),
       ppapi_ipc_channel_handle(ppapi_ipc_channel_handle),
       trusted_ipc_channel_handle(trusted_ipc_channel_handle),
       manifest_service_ipc_channel_handle(manifest_service_ipc_channel_handle),
       plugin_pid(plugin_pid),
       plugin_child_id(plugin_child_id),
       crash_info_shmem_handle(crash_info_shmem_handle) {
 }
 
 NaClLaunchResult::~NaClLaunchResult() {
 }
 
 }  // namespace nacl