Introduce a fake HostStub since there's no need to handle it now

remoting/host/host_stub_fake.cc

Index: remoting/host/host_stub_fake.cc
diff --git a/remoting/host/host_stub_fake.cc b/remoting/host/host_stub_fake.cc
new file mode 100644
index 0000000000000000000000000000000000000000..179dd34f2b7c42b7f2618c229a7f86a254f2fdb2
--- /dev/null
+++ b/remoting/host/host_stub_fake.cc
@@ -0,0 +1,16 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/task.h"
+#include "remoting/host/host_stub_fake.h"
+
+namespace remoting {
+
+void HostStubFake::SuggestResolution(
+    const protocol::SuggestResolutionRequest* msg, Task* done) {
+  done->Run();
+  delete done;
+}
+
+}  // namespace remoting