Fix QUIC faster stats reporting memory leaks and crashes by changing

net/tools/quic/test_tools/quic_test_utils.h

Index: net/tools/quic/test_tools/quic_test_utils.h
diff --git a/net/tools/quic/test_tools/quic_test_utils.h b/net/tools/quic/test_tools/quic_test_utils.h
index d97882e6ec6e16f8129a649f02b514cda387b3ad..a263747c358301f2195cf152d1ff0ac44f32bec2 100644
--- a/net/tools/quic/test_tools/quic_test_utils.h
+++ b/net/tools/quic/test_tools/quic_test_utils.h
@@ -152,9 +152,12 @@ class TestDecompressorVisitor : public QuicSpdyDecompressor::Visitor {
 class MockAckNotifierDelegate : public QuicAckNotifier::DelegateInterface {
  public:
   MockAckNotifierDelegate();
-  virtual ~MockAckNotifierDelegate();
 
   MOCK_METHOD0(OnAckNotification, void());
+
+ protected:
+  // Object is ref counted.
+  virtual ~MockAckNotifierDelegate();
 };
 
 }  // namespace test