Migrate to new keycode constants in keycodes.h.

Change-Id: I775efb0f73b418db5bf65c218949b164f8e65647
diff --git a/simulator/app/DeviceManager.h b/simulator/app/DeviceManager.h
index bd4371e..e3d8af3 100644
--- a/simulator/app/DeviceManager.h
+++ b/simulator/app/DeviceManager.h
@@ -107,7 +107,7 @@
 #endif
 
     // send a key-up or key-down event to the runtime
-    void SendKeyEvent(KeyCode keyCode, bool down);
+    void SendKeyEvent(int32_t keyCode, bool down);
     // send touch-screen events
     void SendTouchEvent(android::Simulator::TouchMode mode, int x, int y);