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

chrome/browser/nacl_host/nacl_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 "build/build_config.h"
 
 #include "chrome/browser/nacl_host/nacl_process_host.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
@@ skipping 116 matching lines @@
   FilePath exe_path = GetChildPath(true);
   if (exe_path.empty())
     return false;
 
   CommandLine* cmd_line = new CommandLine(exe_path);
   nacl::CopyNaClCommandLineArguments(cmd_line);
 
   cmd_line->AppendSwitchWithValue(switches::kProcessType,
                                   switches::kNaClLoaderProcess);
 
-  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID,
-                                  ASCIIToWide(channel_id()));
+  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
 
   // On Windows we might need to start the broker process to launch a new loader
 #if defined(OS_WIN)
   if (running_on_wow64_) {
     NaClBrokerService::GetInstance()->Init(resource_dispatcher_host_);
     return NaClBrokerService::GetInstance()->LaunchLoader(this,
         ASCIIToWide(channel_id()));
   } else {
     BrowserChildProcessHost::Launch(FilePath(), cmd_line);
   }
@@ skipping 128 matching lines @@
   if (fnIsWow64Process != NULL) {
     BOOL bIsWow64 = FALSE;
     if (fnIsWow64Process(GetCurrentProcess(),&bIsWow64)) {
       if (bIsWow64) {
         running_on_wow64_ = true;
       }
     }
   }
 }
 #endif