Migrate to new keycode constants in keycodes.h.

Change-Id: I775efb0f73b418db5bf65c218949b164f8e65647
diff --git a/simulator/app/DeviceManager.cpp b/simulator/app/DeviceManager.cpp
index a859c63..c387d3a 100644
--- a/simulator/app/DeviceManager.cpp
+++ b/simulator/app/DeviceManager.cpp
@@ -278,7 +278,7 @@
  *
  * The events are defined in display_device.h.
  */
-void DeviceManager::SendKeyEvent(KeyCode keyCode, bool down)
+void DeviceManager::SendKeyEvent(int32_t keyCode, bool down)
 {
     android::MessageStream* pStream = GetStream();
     if (pStream == NULL)