RefCounted types should not have public destructors

chrome/browser/net/connection_tester.h

Index: chrome/browser/net/connection_tester.h
diff --git a/chrome/browser/net/connection_tester.h b/chrome/browser/net/connection_tester.h
index 74b8e5e47455a56bd1890edabf051fa7a9da75cc..6f15e74fc8299d77d3e85c6e2b453d9e3a6d05bf 100644
--- a/chrome/browser/net/connection_tester.h
+++ b/chrome/browser/net/connection_tester.h
@@ -103,8 +103,6 @@ class ConnectionTester {
   // delegate methods.
   class Delegate {
    public:
-    virtual ~Delegate() {}
-
     // Called once the test suite is about to start.
     virtual void OnStartConnectionTestSuite() = 0;
 
@@ -122,6 +120,9 @@ class ConnectionTester {
 
     // Called once ALL tests have completed.
     virtual void OnCompletedConnectionTestSuite() = 0;
+
+   protected:
+    virtual ~Delegate() {}
   };
 
   // Constructs a ConnectionTester that notifies test progress to |delegate|.