RefCounted types should not have public destructors, media/ and gpu/ edition

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
diff --git a/gpu/command_buffer/service/context_group.h b/gpu/command_buffer/service/context_group.h
index 7c78f973e31e41e41af56b9567fe8608d1837053..e191c518c6c20867a70ac5bda0a6b6b60dbfe93b 100644
--- a/gpu/command_buffer/service/context_group.h
+++ b/gpu/command_buffer/service/context_group.h
@@ -38,7 +38,6 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
   typedef scoped_refptr<ContextGroup> Ref;
 
   explicit ContextGroup(bool bind_generates_resource);
-  ~ContextGroup();
 
   // This should only be called by GLES2Decoder. This must be paired with a
   // call to destroy if it succeeds.
@@ -112,6 +111,9 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
   IdAllocatorInterface* GetIdAllocator(unsigned namespace_id);
 
  private:
+  friend class base::RefCounted<ContextGroup>;
+  ~ContextGroup();
+
   // Whether or not this context is initialized.
   int num_contexts_;
   bool bind_generates_resource_;