Remove the HostEventStub aggregate interface.

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 aaea51b7198e9a766fbb70bbbd60a86d41201a16..cf0fbd19a43f9d2b03c112b2378b619ae786fbcb 100644
--- a/remoting/host/chromoting_host_unittest.cc
+++ b/remoting/host/chromoting_host_unittest.cc
@@ -194,8 +194,12 @@ class ChromotingHostTest : public testing::Test {
         PassAs<protocol::ConnectionToClient>();
     protocol::ConnectionToClient* connection_ptr = connection.get();
     ClientSession* client = new ClientSession(
-        host_.get(), connection.Pass(), desktop_environment_->event_executor(),
-        desktop_environment_->capturer(), base::TimeDelta());
+        host_.get(),
+        connection.Pass(),
+        desktop_environment_->event_executor(),
+        desktop_environment_->event_executor(),
+        desktop_environment_->capturer(),
+        base::TimeDelta());
     connection_ptr->set_host_stub(client);
 
     context_.network_task_runner()->PostTask(