Remove obsolete chromeos specific code

chrome/app/chrome_exe_main_gtk.cc

Index: chrome/app/chrome_exe_main_gtk.cc
diff --git a/chrome/app/chrome_exe_main_gtk.cc b/chrome/app/chrome_exe_main_gtk.cc
index b902e08afac3a13b734cf8d04e7d70a00faa3dd7..646fde01df94c03237a2ee046605842e78db08d8 100644
--- a/chrome/app/chrome_exe_main_gtk.cc
+++ b/chrome/app/chrome_exe_main_gtk.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -17,7 +17,7 @@ int ChromeMain(int argc, const char** argv);
 int main(int argc, const char** argv) {
   int return_code = ChromeMain(argc, argv);
 
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#if defined(OS_LINUX)
   // Launch a new instance if we're shutting down because we detected an
   // upgrade in the persistent mode.
   upgrade_util::RelaunchChromeBrowserWithNewCommandLineIfNeeded();