[Chromecast] Rename disable_display flag to is_cast_audio_only.

chromecast/media/cma/backend/media_pipeline_backend_manager.cc

 // Copyright 2016 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/backend/media_pipeline_backend_manager.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/memory/ptr_util.h"
 #include "chromecast/chromecast_features.h"
 #include "chromecast/media/cma/backend/media_pipeline_backend_wrapper.h"
 #include "chromecast/public/cast_media_shlib.h"
 
 namespace chromecast {
 namespace media {
 namespace {
-#if BUILDFLAG(DISABLE_DISPLAY)
+#if BUILDFLAG(IS_CAST_AUDIO_ONLY)
 constexpr int kAudioDecoderLimit = std::numeric_limits<int>::max();
 #else
 constexpr int kAudioDecoderLimit = 2;
 #endif
 }  // namespace
 
 MediaPipelineBackendManager::MediaPipelineBackendManager(
     scoped_refptr<base::SingleThreadTaskRunner> media_task_runner)
     : media_task_runner_(std::move(media_task_runner)) {
   DCHECK_EQ(2, NUM_DECODER_TYPES);
@@ skipping 75 matching lines @@
   auto it = volume_by_stream_type_.find(stream_type);
   if (it == volume_by_stream_type_.end()) {
     return 1.0;
   } else {
     return it->second;
   }
 }
 
 }  // namespace media
 }  // namespace chromecast