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

remoting/base/tracer.cc

Index: remoting/base/tracer.cc
diff --git a/remoting/base/tracer.cc b/remoting/base/tracer.cc
index 3245887e311ffc882fa88626db2a568053ec6f8d..3cef3a0f5adfd58b8d624fabe4c05453bd13f927 100644
--- a/remoting/base/tracer.cc
+++ b/remoting/base/tracer.cc
@@ -8,6 +8,7 @@
 
 #include "base/basictypes.h"
 #include "base/condition_variable.h"
+#include "base/lazy_instance.h"
 #include "base/message_loop.h"
 #include "base/rand_util.h"
 #include "base/ref_counted.h"
@@ -88,7 +89,7 @@ class OutputLogger {
   }
 
  private:
-  friend struct DefaultSingletonTraits<OutputLogger>;
+  friend struct base::DefaultLazyInstanceTraits<OutputLogger>;
 
   ~OutputLogger() {
     {
@@ -108,6 +109,11 @@ class OutputLogger {
   std::list<TraceBuffer*> buffers_;
 };
 
+static base::LazyInstance<OutputLogger> g_output_logger(
+    base::LINKER_INITIALIZED);
+static base::LazyInstance<base::ThreadLocalPointer<TraceContext> >
+    g_thread_local_trace_context(base::LINKER_INITIALIZED);
+
 }  // namespace
 
 Tracer::Tracer(const std::string& name, double sample_percent) {
@@ -136,7 +142,7 @@ Tracer::~Tracer() {
   AutoLock l(lock_);
 
   if (buffer_.get()) {
-    Singleton<OutputLogger>::get()->OutputTrace(buffer_.release());
+    g_output_logger.Get().OutputTrace(buffer_.release());
   }
 }
 
@@ -158,11 +164,11 @@ void TraceContext::PopTracer() {
 // static
 TraceContext* TraceContext::Get() {
   TraceContext* context =
-      Singleton<base::ThreadLocalPointer<TraceContext> >::get()->Get();
+      g_thread_local_trace_context.Get().Get();
   if (context == NULL) {
     context = new TraceContext();
     context->PushTracerInternal(new Tracer("default", 0.0));
-    Singleton<base::ThreadLocalPointer<TraceContext> >::get()->Set(context);
+    g_thread_local_trace_context.Get().Set(context);
   }
   return context;
 }