RefCounted types should not have public destructors

base/memory/weak_ptr.h

Index: base/memory/weak_ptr.h
diff --git a/base/memory/weak_ptr.h b/base/memory/weak_ptr.h
index d7c452f1dbb0f796cd6e23f21542a606ee8fe10e..8485c146670d008fad8526f2614503b2368d7a8f 100644
--- a/base/memory/weak_ptr.h
+++ b/base/memory/weak_ptr.h
@@ -162,6 +162,10 @@ class SupportsWeakPtrBase {
     return AsWeakPtrImpl<Derived>(t, *t);
   }
 
+ protected:
+  SupportsWeakPtrBase() {}
+  ~SupportsWeakPtrBase() {}
+
  private:
   // This template function uses type inference to find a Base of Derived
   // which is an instance of SupportsWeakPtr<Base>. We can then safely