first-run: Refactor Upgrade class into a common upgrade_util API.

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 bf9589de289db061edcbf27419a4257a5b3962cc..1e3fa0e37433fcdf36566c29f51bc6751792d4ad 100644
--- a/chrome/app/chrome_exe_main_gtk.cc
+++ b/chrome/app/chrome_exe_main_gtk.cc
@@ -6,7 +6,7 @@
 #include "build/build_config.h"
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-#include "chrome/browser/first_run/upgrade.h"
+#include "chrome/browser/first_run/upgrade_util.h"
 #endif
 
 // The entry point for all invocations of Chromium, browser and renderer. On
@@ -51,7 +51,7 @@ int main(int argc, const char** argv) {
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // Launch a new instance if we're shutting down because we detected an
   // upgrade in the persistent mode.
-  Upgrade::RelaunchChromeBrowserWithNewCommandLineIfNeeded();
+  upgrade_util::RelaunchChromeBrowserWithNewCommandLineIfNeeded();
 #endif
 
   return return_code;