Move Singleton and related structs to namespace base

base/logging_win.cc

Index: base/logging_win.cc
diff --git a/base/logging_win.cc b/base/logging_win.cc
index 53cc37c4ea32c6ccf09083dd7210388ce8143688..319ae8a9d38186aa7ffc6466f574c2a795a1832c 100644
--- a/base/logging_win.cc
+++ b/base/logging_win.cc
@@ -18,8 +18,8 @@ LogEventProvider::LogEventProvider() : old_log_level_(LOG_NONE) {
 }
 
 LogEventProvider* LogEventProvider::GetInstance() {
-  return Singleton<LogEventProvider,
-                   StaticMemorySingletonTraits<LogEventProvider> >::get();
+  return base::Singleton<LogEventProvider, base::StaticMemorySingletonTraits<
+                                               LogEventProvider>>::get();
 }
 
 bool LogEventProvider::LogMessage(logging::LogSeverity severity,