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

chrome/browser/utility_process_host.cc

Index: chrome/browser/utility_process_host.cc
diff --git a/chrome/browser/utility_process_host.cc b/chrome/browser/utility_process_host.cc
index 857c38d86a2e71afafe48e5f7ec1ff8015119f30..dbcf94b7112f9a5544381e96adaf575ec4ef3343 100644
--- a/chrome/browser/utility_process_host.cc
+++ b/chrome/browser/utility_process_host.cc
@@ -80,8 +80,7 @@ bool UtilityProcessHost::StartProcess(const FilePath& exposed_dir) {
   CommandLine* cmd_line = new CommandLine(exe_path);
   cmd_line->AppendSwitchWithValue(switches::kProcessType,
                                   switches::kUtilityProcess);
-  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID,
-                                  ASCIIToWide(channel_id()));
+  cmd_line->AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
   std::string locale = g_browser_process->GetApplicationLocale();
   cmd_line->AppendSwitchWithValue(switches::kLang, locale);
 
@@ -114,8 +113,7 @@ bool UtilityProcessHost::StartProcess(const FilePath& exposed_dir) {
         switches::kUtilityCmdPrefix));
   }
 
-  cmd_line->AppendSwitchWithValue(switches::kUtilityProcessAllowedDir,
-                                  exposed_dir.value().c_str());
+  cmd_line->AppendSwitchPath(switches::kUtilityProcessAllowedDir, exposed_dir);
 #endif
 
   Launch(