Added "--login-user=" option for the Guest session.

chrome/browser/chromeos/login/login_utils.cc

Index: chrome/browser/chromeos/login/login_utils.cc
diff --git a/chrome/browser/chromeos/login/login_utils.cc b/chrome/browser/chromeos/login/login_utils.cc
index 342cd5fff8b7879aee38dfe03c31cffac60ea82f..5aa016ca222d033e7d562293b60835a9294ca925 100644
--- a/chrome/browser/chromeos/login/login_utils.cc
+++ b/chrome/browser/chromeos/login/login_utils.cc
@@ -72,6 +72,9 @@ const char kGuestModeLoggingLevel[] = "1";
 // Format of command line switch.
 const char kSwitchFormatString[] = " --%s=\"%s\"";
 
+// User name which is used in the Guest session.
+const char kGuestUserName[] = "";
+
 // Resets the proxy configuration service for the default request context.
 class ResetDefaultProxyConfigServiceTask : public Task {
  public:
@@ -424,6 +427,8 @@ std::string LoginUtilsImpl::GetOffTheRecordCommandLine(
   command_line->AppendSwitchASCII(switches::kLoggingLevel,
                                  kGuestModeLoggingLevel);
 
+  command_line->AppendSwitchASCII(switches::kLoginUser, kGuestUserName);
+
   if (start_url.is_valid())
     command_line->AppendArg(start_url.spec());