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

chrome/service/service_utility_process_host.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/service/service_utility_process_host.h"
 
 #include "app/app_switches.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
@@ skipping 65 matching lines @@
 
   FilePath exe_path = GetUtilityProcessCmd();
   if (exe_path.empty()) {
     NOTREACHED() << "Unable to get utility process binary name.";
     return false;
   }
 
   CommandLine cmd_line(exe_path);
   cmd_line.AppendSwitchWithValue(switches::kProcessType,
                                  switches::kUtilityProcess);
-  cmd_line.AppendSwitchWithValue(switches::kProcessChannelID,
-                                 ASCIIToWide(channel_id()));
+  cmd_line.AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
   cmd_line.AppendSwitch(switches::kLang);
 
   return Launch(&cmd_line);
 }
 
 FilePath ServiceUtilityProcessHost::GetUtilityProcessCmd() {
   return GetChildPath(true);
 }
 
 void ServiceUtilityProcessHost::OnChildDied() {
@@ skipping 40 matching lines @@
   IPC_BEGIN_MESSAGE_MAP(ServiceUtilityProcessHost, message)
 #if defined(OS_WIN)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_RenderPDFPagesToMetafile_Succeeded,
                         Client::OnRenderPDFPagesToMetafileSucceeded)
 #endif  // OS_WIN
     IPC_MESSAGE_HANDLER(UtilityHostMsg_RenderPDFPagesToMetafile_Failed,
                         Client::OnRenderPDFPagesToMetafileFailed)
   IPC_END_MESSAGE_MAP_EX()
 }