Change the net_task_runner to use a TestMockTimeTaskRunner in unittests so that

net/http/http_server_properties_manager.cc

Index: net/http/http_server_properties_manager.cc
diff --git a/net/http/http_server_properties_manager.cc b/net/http/http_server_properties_manager.cc
index 6f1b8a6a0b5f739df463561c7f90db345a46431d..17bd640e108ff667819ad4998f4aed02a184b610 100644
--- a/net/http/http_server_properties_manager.cc
+++ b/net/http/http_server_properties_manager.cc
@@ -100,7 +100,7 @@ void HttpServerPropertiesManager::InitializeOnNetworkThread() {
   http_server_properties_impl_.reset(new HttpServerPropertiesImpl());
 
   network_prefs_update_timer_.reset(new base::OneShotTimer);
-
+  network_prefs_update_timer_->SetTaskRunner(std::move(network_task_runner_));

[Ryan Hamilton, 2016/12/12 05:30:20]

Do you need to move the task runner? It's a scoped_refptr, so I think it's
copyable. I'm not sure what std::move does in this case, but it kinda seems like
it might leave network_task_runner_ set to null.

[Zhongyi Shi, 2016/12/12 21:14:46]

Done.

   pref_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&HttpServerPropertiesManager::UpdateCacheFromPrefsOnPrefThread,