Move Singleton and related structs to namespace base

base/trace_event/trace_event_win.cc

Index: base/trace_event/trace_event_win.cc
diff --git a/base/trace_event/trace_event_win.cc b/base/trace_event/trace_event_win.cc
index fdbd35a0e2feda383072f9c3e78a1b5668b919e1..f8eb464bbf5ffcb2b0aff18b489cb27e95998dfc 100644
--- a/base/trace_event/trace_event_win.cc
+++ b/base/trace_event/trace_event_win.cc
@@ -41,8 +41,8 @@ TraceEventETWProvider::TraceEventETWProvider() :
 }
 
 TraceEventETWProvider* TraceEventETWProvider::GetInstance() {
-  return Singleton<TraceEventETWProvider,
-      StaticMemorySingletonTraits<TraceEventETWProvider> >::get();
+  return base::Singleton<TraceEventETWProvider,
+      base::StaticMemorySingletonTraits<TraceEventETWProvider> >::get();
 }
 
 bool TraceEventETWProvider::StartTracing() {