Revert r46023: "Detect new instance of the browser when running in the background in persistent"

chrome/app/chrome_exe_main_gtk.cc

 // Copyright (c) 2008 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 "base/at_exit.h"
 #include "base/process_util.h"
-#include "chrome/browser/first_run.h"
 
 // The entry point for all invocations of Chromium, browser and renderer. On
 // windows, this does nothing but load chrome.dll and invoke its entry point in
 // order to make it easy to update the app from GoogleUpdate. We don't need
 // that extra layer with on linux.
 //
 // TODO(tc): This is similar to chrome_exe_main.mm.  After it's more clear what
 // needs to go here, we should evaluate whether or not to merge this file with
 // chrome_exe_main.mm.
 
@@ skipping 20 matching lines @@
 #if defined(OS_LINUX) && defined(USE_TCMALLOC)
   // For tcmalloc, we need to tell it to behave like new.
   tc_set_new_mode(1);
 #endif
 
   // The exit manager is in charge of calling the dtors of singletons.
   // Win has one here, but we assert with multiples from BrowserMain() if we
   // keep it.
   // base::AtExitManager exit_manager;
 
-  int return_code = ChromeMain(argc, argv);
-
-  // Launch a new instance if we're shutting down because we detected an
-  // upgrade in the persistent mode.
-  Upgrade::RelaunchChromeBrowserWithNewCommandLineIfNeeded();
-
-  return return_code;
+  return ChromeMain(argc, argv);
 }