CommandLine: add a CopySwitchesFrom() for copying from another CommandLine

chrome/browser/nacl_host/nacl_broker_host_win.cc

 // Copyright (c) 2010 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 "chrome/browser/nacl_host/nacl_broker_host_win.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "ipc/ipc_switches.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 29 matching lines @@
   if (!PathService::Get(base::FILE_MODULE, &module_path))
     return false;
 
   FilePath nacl_path = module_path.DirName().Append(chrome::kNaClAppName);
   CommandLine* cmd_line = new CommandLine(nacl_path);
   nacl::CopyNaClCommandLineArguments(cmd_line);
 
   cmd_line->AppendSwitchWithValue(switches::kProcessType,
       switches::kNaClBrokerProcess);
 
-  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID,
-      ASCIIToWide(channel_id()));
+  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
 
   BrowserChildProcessHost::Launch(FilePath(), cmd_line);
   return true;
 }
 
 void NaClBrokerHost::OnMessageReceived(const IPC::Message& msg) {
   IPC_BEGIN_MESSAGE_MAP(NaClBrokerHost, msg)
     IPC_MESSAGE_HANDLER(NaClProcessMsg_LoaderLaunched, OnLoaderLaunched)
   IPC_END_MESSAGE_MAP()
 }
 
 bool NaClBrokerHost::LaunchLoader(
     const std::wstring& loader_channel_id) {
   return Send(new NaClProcessMsg_LaunchLoaderThroughBroker(loader_channel_id));
 }
 
 void NaClBrokerHost::OnLoaderLaunched(const std::wstring& loader_channel_id,
                                       base::ProcessHandle handle) {
   NaClBrokerService::GetInstance()->OnLoaderLaunched(loader_channel_id, handle);
 }
 
 void NaClBrokerHost::StopBroker() {
   stopping_ = true;
   Send(new NaClProcessMsg_StopBroker());
 }