Removes StaticAccessedFromInstance warning in Android audio track.

Fixes the warning below:

WebRtcAudioTrack.java:364: warning: [StaticAccessedFromInstance] Static method getMaxVolume
should not be accessed from an object instance; instead use AudioTrack.getMaxVolume
+ "max gain: " + audioTrack.getMaxVolume());

Bug: NONE
Change-Id: I6247584b65ac972a6a3739fba718387873964f9f
Reviewed-on: https://webrtc-review.googlesource.com/14180
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20371}
diff --git a/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java b/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java
index 26d8310..ae0217d 100644
--- a/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java
+++ b/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java
@@ -221,7 +221,7 @@
   private boolean initPlayout(int sampleRate, int channels) {
     Logging.d(TAG, "initPlayout(sampleRate=" + sampleRate + ", channels=" + channels + ")");
     final int bytesPerFrame = channels * (BITS_PER_SAMPLE / 8);
-    byteBuffer = byteBuffer.allocateDirect(bytesPerFrame * (sampleRate / BUFFERS_PER_SECOND));
+    byteBuffer = ByteBuffer.allocateDirect(bytesPerFrame * (sampleRate / BUFFERS_PER_SECOND));
     Logging.d(TAG, "byteBuffer.capacity: " + byteBuffer.capacity());
     emptyBytes = new byte[byteBuffer.capacity()];
     // Rather than passing the ByteBuffer with every callback (requiring
@@ -361,7 +361,7 @@
             + "channels: " + audioTrack.getChannelCount() + ", "
             + "sample rate: " + audioTrack.getSampleRate() + ", "
             // Gain (>=1.0) expressed as linear multiplier on sample values.
-            + "max gain: " + audioTrack.getMaxVolume());
+            + "max gain: " + AudioTrack.getMaxVolume());
   }
 
   // Creates and AudioTrack instance using AudioAttributes and AudioFormat as input.