Revert "main: Make sure that --mode parameter is valid"

This reverts commit a7a46bbe1c.

Conflicts:

	js/ui/sessionMode.js

src/main.c

@@ -393,12 +393,6 @@ main (int argc, char **argv)
 
   _shell_global_init ("session-mode", session_mode, NULL);
 
-  if (!_shell_global_has_valid_session_mode (shell_global_get ()))
-    {
-      g_printerr ("\"%s\" is not a valid mode.\n", session_mode);
-      exit(1);
-    }
-
   ecode = meta_run ();
 
   if (g_getenv ("GNOME_SHELL_ENABLE_CLEANUP"))

src/shell-global-private.h

@@ -13,7 +13,6 @@ void _shell_global_set_plugin      (ShellGlobal  *global,
 
 GjsContext *_shell_global_get_gjs_context (ShellGlobal  *global);
 
-gboolean _shell_global_has_valid_session_mode (ShellGlobal *global);
 gboolean _shell_global_check_xdnd_event (ShellGlobal  *global,
                                          XEvent       *xev);
 

src/shell-global.c

@@ -585,21 +585,6 @@ shell_global_set_stage_input_mode (ShellGlobal         *global,
     }
 }
 
-gboolean
-_shell_global_has_valid_session_mode (ShellGlobal *global)
-{
-  char *script;
-  int status;
-
-  script = g_strdup_printf ("imports.ui.environment.init();"
-                            "imports.ui.sessionMode.modeExists('%s') || 1;",
-                            global->session_mode);
-  gjs_context_eval (global->js_context, script, -1, "<sessionMode.js>", &status, NULL);
-  g_free (script);
-
-  return status == 0;
-}
-
 /**
  * shell_global_set_cursor:
  * @global: A #ShellGlobal