Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

chrome/browser/service/service_process_control.cc

Index: chrome/browser/service/service_process_control.cc
diff --git a/chrome/browser/service/service_process_control.cc b/chrome/browser/service/service_process_control.cc
index fdeea6d59827ab4d5d5c01b53b70cf02c33e957e..bd98319d5a7e3acc0677ffe73afc2ad9d7786227 100644
--- a/chrome/browser/service/service_process_control.cc
+++ b/chrome/browser/service/service_process_control.cc
@@ -129,7 +129,7 @@ void ServiceProcessControl::ConnectInternal() {
 
   // We just established a channel with the service process. Notify it if an
   // upgrade is available.
-  if (Singleton<UpgradeDetector>::get()->notify_upgrade()) {
+  if (UpgradeDetector::GetInstance()->notify_upgrade()) {
     Send(new ServiceMsg_UpdateAvailable);
   } else {
     if (registrar_.IsEmpty())