RefCounted types should not have public destructors, delegate cleanup

chrome/browser/policy/policy_service.h

Index: chrome/browser/policy/policy_service.h
diff --git a/chrome/browser/policy/policy_service.h b/chrome/browser/policy/policy_service.h
index 94f57aead76f39b97565051e4d58ad335fa4b39c..e2d28f0152ca802c53c668d1fcf226699b6217f1 100644
--- a/chrome/browser/policy/policy_service.h
+++ b/chrome/browser/policy/policy_service.h
@@ -36,8 +36,6 @@ class PolicyService {
  public:
   class Observer {
    public:
-    virtual ~Observer() {}
-
     // Invoked whenever policies for the |domain|, |component_id| namespace are
     // modified. This is only invoked for changes that happen after AddObserver
     // is called. |previous| contains the values of the policies before the
@@ -51,6 +49,9 @@ class PolicyService {
     // IsInitializationComplete() is false, then this will be invoked once all
     // the policy providers are ready.
     virtual void OnPolicyServiceInitialized() {}
+
+   protected:
+    virtual ~Observer() {}
   };
 
   virtual ~PolicyService() {}