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

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 8b612c7fe1f395ac4697f382d641a3873101a30c..0ed9e15cad7d4727a34cad2195e221e5841d832f 100644
--- a/chrome/app/chrome_exe_main_gtk.cc
+++ b/chrome/app/chrome_exe_main_gtk.cc
@@ -4,7 +4,6 @@
 
 #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
@@ -45,11 +44,5 @@ int main(int argc, const char** argv) {
   // 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);
 }