CrOS: Set --login-profile for Guest session on linux-chromeos

This CL fixes DCHECK on Chrome OS when trying to run Guest session from
the login screen.

Fixed: 1163345
Change-Id: I9b4ad69186dd217fc792d67c480743430b171664
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632653Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845255}

chrome/browser/chromeos/login/chrome_restart_request.cc

@@ -351,6 +351,9 @@ void GetOffTheRecordCommandLine(const GURL& start_url,
   otr_switches.SetString(
       switches::kLoginUser,
       cryptohome::Identification(user_manager::GuestAccountId()).id());
+  if (!base::SysInfo::IsRunningOnChromeOS()) {
+    otr_switches.SetString(switches::kLoginProfile, chrome::kLegacyProfileDir);
+  }
 
   // Override the home page.
   otr_switches.SetString(::switches::kHomePage,