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

webkit/glue/plugins/pepper_resource_tracker.cc

Index: webkit/glue/plugins/pepper_resource_tracker.cc
diff --git a/webkit/glue/plugins/pepper_resource_tracker.cc b/webkit/glue/plugins/pepper_resource_tracker.cc
index 997ef63c655d6d46eaa08f7ee1dfb7755d968033..9623e9881e230a45e937d6a4a1ba63ee040b950d 100644
--- a/webkit/glue/plugins/pepper_resource_tracker.cc
+++ b/webkit/glue/plugins/pepper_resource_tracker.cc
@@ -7,11 +7,15 @@
 #include <limits>
 #include <set>
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "ppapi/c/pp_resource.h"
 #include "webkit/glue/plugins/pepper_resource.h"
 
+static base::LazyInstance<pepper::ResourceTracker> g_resource_tracker(
+    base::LINKER_INITIALIZED);
+
 namespace pepper {
 
 scoped_refptr<Resource> ResourceTracker::GetResource(PP_Resource res) const {
@@ -36,7 +40,7 @@ ResourceTracker::~ResourceTracker() {
 ResourceTracker* ResourceTracker::Get() {
   if (singleton_override_)
     return singleton_override_;
-  return Singleton<ResourceTracker>::get();
+  return g_resource_tracker.Pointer();
 }
 
 PP_Resource ResourceTracker::AddResource(Resource* resource) {