RefCounted types should not have public destructors

base/threading/non_thread_safe.h

Index: base/threading/non_thread_safe.h
diff --git a/base/threading/non_thread_safe.h b/base/threading/non_thread_safe.h
index a104ae3d298391e68fdc9a80d6801a2e71d87177..2f44dcae4d5c5b62a91e8de818a77e84f4ee408f 100644
--- a/base/threading/non_thread_safe.h
+++ b/base/threading/non_thread_safe.h
@@ -62,11 +62,9 @@ class NonThreadSafeDoNothing {
 // NonThreadSafe. For more details about when to choose one over the other, see
 // the documentation for base::ThreadChecker.
 #if ENABLE_NON_THREAD_SAFE
-class NonThreadSafe : public NonThreadSafeImpl {
-};
+typedef NonThreadSafeImpl NonThreadSafe;
 #else
-class NonThreadSafe : public NonThreadSafeDoNothing {
-};
+typedef NonThreadSafeDoNothing NonThreadSafe;
 #endif  // ENABLE_NON_THREAD_SAFE
 
 #undef ENABLE_NON_THREAD_SAFE