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

chrome/browser/profile_import_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/browser/profile_import_process_host.h"
 
 #include "app/l10n_util.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
@@ skipping 69 matching lines @@
 
   FilePath exe_path = GetProfileImportProcessCmd();
   if (exe_path.empty()) {
     NOTREACHED() << "Unable to get profile import process binary name.";
     return false;
   }
 
   CommandLine* cmd_line = new CommandLine(exe_path);
   cmd_line->AppendSwitchWithValue(switches::kProcessType,
                                   switches::kProfileImportProcess);
-  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID,
-                                  ASCIIToWide(channel_id()));
+  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
 
   SetCrashReporterCommandLine(cmd_line);
 
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   if (browser_command_line.HasSwitch(switches::kChromeFrame))
     cmd_line->AppendSwitch(switches::kChromeFrame);
 
 #if defined(OS_MACOSX)
   base::environment_vector env;
   std::string dylib_path = GetFirefoxDylibPath().value();
@@ skipping 58 matching lines @@
     IPC_MESSAGE_HANDLER(ProfileImportProcessHostMsg_NotifyFavIconsImportStart,
                         ImportProcessClient::OnFavIconsImportStart)
     IPC_MESSAGE_HANDLER(ProfileImportProcessHostMsg_NotifyFavIconsImportGroup,
                         ImportProcessClient::OnFavIconsImportGroup)
     IPC_MESSAGE_HANDLER(ProfileImportProcessHostMsg_NotifyPasswordFormReady,
                         ImportProcessClient::OnPasswordFormImportReady)
     IPC_MESSAGE_HANDLER(ProfileImportProcessHostMsg_NotifyKeywordsReady,
                         ImportProcessClient::OnKeywordsImportReady)
   IPC_END_MESSAGE_MAP_EX()
 }