Make members of Singleton<T> private and only visible to the singleton type.

media/tools/player_wtl/movie.cc

Index: media/tools/player_wtl/movie.cc
diff --git a/media/tools/player_wtl/movie.cc b/media/tools/player_wtl/movie.cc
index 70ede51b578b4a478648245973feabcd8296ba6f..7a06cb9bc6d570e7b4aee81cb7c3d3ea85d18941 100644
--- a/media/tools/player_wtl/movie.cc
+++ b/media/tools/player_wtl/movie.cc
@@ -4,6 +4,7 @@
 
 #include "media/tools/player_wtl/movie.h"
 
+#include "base/singleton.h"
 #include "base/utf_string_conversions.h"
 #include "media/base/filter_collection.h"
 #include "media/base/pipeline_impl.h"
@@ -39,6 +40,10 @@ Movie::Movie()
 Movie::~Movie() {
 }
 
+Movie* Movie::GetInstance() {
+  return Singleton<Movie>::get();
+}
+
 bool Movie::IsOpen() {
   return pipeline_ != NULL;
 }