MidiFile uses C++ Thread not createThreadEtc

This permits leveraging future improvements to Thread.

Change-Id: I323b709e935c47fa3c6041cb8b82fda994e78b56
diff --git a/media/libmediaplayerservice/MidiFile.cpp b/media/libmediaplayerservice/MidiFile.cpp
index 85b1f9d..4946956 100644
--- a/media/libmediaplayerservice/MidiFile.cpp
+++ b/media/libmediaplayerservice/MidiFile.cpp
@@ -86,7 +86,8 @@
     // create playback thread
     {
         Mutex::Autolock l(mMutex);
-        createThreadEtc(renderThread, this, "midithread", ANDROID_PRIORITY_AUDIO);
+        mThread = new MidiFileThread(this);
+        mThread->run("midithread", ANDROID_PRIORITY_AUDIO);
         mCondition.wait(mMutex);
         ALOGV("thread started");
     }
@@ -427,11 +428,6 @@
     return NO_ERROR;
 }
 
-int MidiFile::renderThread(void* p) {
-
-    return ((MidiFile*)p)->render();
-}
-
 int MidiFile::render() {
     EAS_RESULT result = EAS_FAILURE;
     EAS_I32 count;