Revert "Use AudioTrack::event_type not int in callback"

This reverts commit 2225e4b7049fa3fb9d39a068b8268b63c952d7c1
diff --git a/media/libstagefright/AudioPlayer.cpp b/media/libstagefright/AudioPlayer.cpp
index c2bacb7..dd69e6b 100644
--- a/media/libstagefright/AudioPlayer.cpp
+++ b/media/libstagefright/AudioPlayer.cpp
@@ -249,7 +249,7 @@
 }
 
 // static
-void AudioPlayer::AudioCallback(AudioTrack::event_type event, void *user, void *info) {
+void AudioPlayer::AudioCallback(int event, void *user, void *info) {
     static_cast<AudioPlayer *>(user)->AudioCallback(event, info);
 }
 
@@ -275,7 +275,7 @@
     return me->fillBuffer(buffer, size);
 }
 
-void AudioPlayer::AudioCallback(AudioTrack::event_type event, void *info) {
+void AudioPlayer::AudioCallback(int event, void *info) {
     if (event != AudioTrack::EVENT_MORE_DATA) {
         return;
     }