AudioFlinger: Remove code for supporting resampling in fast tracks

This isn't used at the moment.

Change-Id: I4e0fb2af5f7d959dbafd5ddb7defa1c6b8e8636a
diff --git a/services/audioflinger/FastMixerState.cpp b/services/audioflinger/FastMixerState.cpp
index 737de97..43ff233 100644
--- a/services/audioflinger/FastMixerState.cpp
+++ b/services/audioflinger/FastMixerState.cpp
@@ -20,7 +20,7 @@
 namespace android {
 
 FastTrack::FastTrack() :
-    mBufferProvider(NULL), mVolumeProvider(NULL), mSampleRate(0),
+    mBufferProvider(NULL), mVolumeProvider(NULL),
     mChannelMask(AUDIO_CHANNEL_OUT_STEREO), mGeneration(0)
 {
 }