Add a new GetInstance() method for singleton classes, take 2.

ceee/ie/broker/broker.cc

Index: ceee/ie/broker/broker.cc
diff --git a/ceee/ie/broker/broker.cc b/ceee/ie/broker/broker.cc
index 36e8bc8c78d35360df2cdbd6714d4d7b919c3b4c..65ea3769a656e63ed54ca21202c8cf2172f3fd44 100644
--- a/ceee/ie/broker/broker.cc
+++ b/ceee/ie/broker/broker.cc
@@ -16,9 +16,8 @@
 
 HRESULT CeeeBroker::FinalConstruct() {
   // So that we get a pointer to the ExecutorsManager and let tests override it.
-  executors_manager_ = Singleton<ExecutorsManager,
-                                 ExecutorsManager::SingletonTraits>::get();
-  api_dispatcher_ = ProductionApiDispatcher::get();
+  executors_manager_ = ExecutorsManager::GetInstance();
+  api_dispatcher_ = ProductionApiDispatcher::GetInstance();
   return S_OK;
 }