Clear cached QUIC network stats when a QUIC handshake fails.

net/http/http_server_properties_manager_unittest.cc

Index: net/http/http_server_properties_manager_unittest.cc
diff --git a/net/http/http_server_properties_manager_unittest.cc b/net/http/http_server_properties_manager_unittest.cc
index 0b9fb61c4e89f312bf9060b1956d2a63372d1700..4fbf97e5e1147f88dfb5cc9a564879ad6ff63939 100644
--- a/net/http/http_server_properties_manager_unittest.cc
+++ b/net/http/http_server_properties_manager_unittest.cc
@@ -907,6 +907,24 @@ TEST_P(HttpServerPropertiesManagerTest, ServerNetworkStats) {
   const ServerNetworkStats* stats2 =
       http_server_props_manager_->GetServerNetworkStats(mail_server);
   EXPECT_EQ(10, stats2->srtt.ToInternalValue());
+
+  ExpectPrefsUpdate(1);
+  ExpectScheduleUpdatePrefsOnNetworkThread();
+
+  http_server_props_manager_->ClearServerNetworkStats(mail_server);
+
+  // Run the task.
+  EXPECT_FALSE(pref_test_task_runner_->HasPendingTask());
+  EXPECT_TRUE(net_test_task_runner_->HasPendingTask());
+  net_test_task_runner_->FastForwardUntilNoTasksRemain();
+  EXPECT_TRUE(pref_test_task_runner_->HasPendingTask());
+  pref_test_task_runner_->FastForwardUntilNoTasksRemain();
+  EXPECT_FALSE(net_test_task_runner_->HasPendingTask());
+  EXPECT_FALSE(pref_test_task_runner_->HasPendingTask());
+
+  Mock::VerifyAndClearExpectations(http_server_props_manager_.get());
+  EXPECT_EQ(nullptr,
+            http_server_props_manager_->GetServerNetworkStats(mail_server));
 }
 
 TEST_P(HttpServerPropertiesManagerTest, QuicServerInfo) {