Connect to DesktopEnvironment's stubs only when audio/video schedulers are about to be created.

remoting/host/chromoting_host_unittest.cc

Index: remoting/host/chromoting_host_unittest.cc
diff --git a/remoting/host/chromoting_host_unittest.cc b/remoting/host/chromoting_host_unittest.cc
index 6e7c3268f180fc65244e187034f1c22b819b336a..0235512fe1a30c8d783ff8cdc973d6d459c70a85 100644
--- a/remoting/host/chromoting_host_unittest.cc
+++ b/remoting/host/chromoting_host_unittest.cc
@@ -244,8 +244,6 @@ class ChromotingHostTest : public testing::Test {
         desktop_environment_factory_.get(),
         base::TimeDelta());
     connection_ptr->set_host_stub(client);
-    connection_ptr->set_input_stub(
-        client->desktop_environment()->event_executor());
 
     ui_task_runner_->PostTask(
         FROM_HERE, base::Bind(&ChromotingHostTest::AddClientToHost,