Remove support for Windows-style keycodes.

remoting/protocol/client_event_dispatcher.cc

Index: remoting/protocol/client_event_dispatcher.cc
diff --git a/remoting/protocol/client_event_dispatcher.cc b/remoting/protocol/client_event_dispatcher.cc
index 49f05f729686eeaaff91d92c0180f5835fd89887..afc481fb5ac1f429d3a45e26033aa37ff8949296 100644
--- a/remoting/protocol/client_event_dispatcher.cc
+++ b/remoting/protocol/client_event_dispatcher.cc
@@ -30,7 +30,7 @@ void ClientEventDispatcher::OnInitialized() {
 }
 
 void ClientEventDispatcher::InjectKeyEvent(const KeyEvent& event) {
-  DCHECK(event.has_keycode() || event.has_usb_keycode());
+  DCHECK(event.has_usb_keycode());
   DCHECK(event.has_pressed());
   EventMessage message;
   message.set_sequence_number(base::Time::Now().ToInternalValue());