Migrate to new keycode constants in keycodes.h.

Change-Id: I775efb0f73b418db5bf65c218949b164f8e65647
diff --git a/simulator/app/PhoneData.cpp b/simulator/app/PhoneData.cpp
index f15df2b..f6756f5 100644
--- a/simulator/app/PhoneData.cpp
+++ b/simulator/app/PhoneData.cpp
@@ -413,7 +413,7 @@
 /*
  * Find the first button with a matching key code.
  */
-PhoneButton* PhoneView::FindButtonByKey(KeyCode keyCode)
+PhoneButton* PhoneView::FindButtonByKey(int32_t keyCode)
 {
     typedef List<PhoneButton>::iterator Iter;