Expire but don't clear HostCache on DNS config change

components/cronet/stale_host_resolver_unittest.cc

Index: components/cronet/stale_host_resolver_unittest.cc
diff --git a/components/cronet/stale_host_resolver_unittest.cc b/components/cronet/stale_host_resolver_unittest.cc
index 56538099deb95a64e7d2a988cba4746a15f6e7f3..648aae6dc8eaf7a23dafc199ff987de6b83ce99f 100644
--- a/components/cronet/stale_host_resolver_unittest.cc
+++ b/components/cronet/stale_host_resolver_unittest.cc
@@ -162,7 +162,9 @@ class StaleHostResolverTest : public testing::Test {
   }
 
   void OnNetworkChange() {
+    // Real network changes on Android will send both notifications.
     net::NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests();
+    net::NetworkChangeNotifier::NotifyObserversOfDNSChangeForTests();
     base::RunLoop().RunUntilIdle();  // Wait for notification.
   }