Clean up AudioTrackThread and AudioRecordThread constructor

Remove unused argument.

Test: compile
Change-Id: I1f589941686ddcdff166298f8bfe0564b147c137
diff --git a/media/libaudioclient/AudioTrack.cpp b/media/libaudioclient/AudioTrack.cpp
index 670a200..60e841c 100644
--- a/media/libaudioclient/AudioTrack.cpp
+++ b/media/libaudioclient/AudioTrack.cpp
@@ -615,7 +615,7 @@
     mCbf = cbf;
 
     if (cbf != NULL) {
-        mAudioTrackThread = new AudioTrackThread(*this, threadCanCallJava);
+        mAudioTrackThread = new AudioTrackThread(*this);
         mAudioTrackThread->run("AudioTrack", ANDROID_PRIORITY_AUDIO, 0 /*stack*/);
         // thread begins in paused state, and will not reference us until start()
     }
@@ -3127,7 +3127,7 @@
 
 // =========================================================================
 
-AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver, bool bCanCallJava __unused)
+AudioTrack::AudioTrackThread::AudioTrackThread(AudioTrack& receiver)
     : Thread(true /* bCanCallJava */)  // binder recursion on restoreTrack_l() may call Java.
     , mReceiver(receiver), mPaused(true), mPausedInt(false), mPausedNs(0LL),
       mIgnoreNextPausedInt(false)