[Chromecast] Upgrade to new CMA backend API

chromecast/media/cma/pipeline/audio_pipeline.cc

Index: chromecast/media/cma/pipeline/audio_pipeline.cc
diff --git a/chromecast/media/cma/pipeline/audio_pipeline.cc b/chromecast/media/cma/pipeline/audio_pipeline.cc
deleted file mode 100644
index 7d98e09f2c46cf6a1d62f9e6d8f92e26fdb2b547..0000000000000000000000000000000000000000
--- a/chromecast/media/cma/pipeline/audio_pipeline.cc
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chromecast/media/cma/pipeline/audio_pipeline.h"
-
-namespace chromecast {
-namespace media {
-
-AudioPipeline::AudioPipeline() {
-}
-
-AudioPipeline::~AudioPipeline() {
-}
-
-}  // namespace media
-}  // namespace chromecast