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

media/tools/player_wtl/movie.h

Index: media/tools/player_wtl/movie.h
diff --git a/media/tools/player_wtl/movie.h b/media/tools/player_wtl/movie.h
index e505165e6b1e12577001ee3b71c1a983ab70bfa2..581a0db5bbb9aeb1235a31aa033fcf23e02ba512 100644
--- a/media/tools/player_wtl/movie.h
+++ b/media/tools/player_wtl/movie.h
@@ -11,17 +11,20 @@
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
-#include "base/singleton.h"
 #include "base/thread.h"
 
+template <typename T> struct DefaultSingletonTraits;
 class WtlVideoRenderer;
 
 namespace media {
 
 class PipelineImpl;
 
-class Movie : public Singleton<Movie> {
+class Movie {
  public:
+   // Returns the singleton instance.
+  static Movie* GetInstance();
+
   // Open a movie.
   bool Open(const wchar_t* url, WtlVideoRenderer* video_renderer);