Set the AudioManager factory before the browser main loop.

chromecast/browser/media/audio_manager_factory_simple.cc

Index: chromecast/browser/media/audio_manager_factory_simple.cc
diff --git a/chromecast/browser/media/audio_manager_factory_simple.cc b/chromecast/browser/media/audio_manager_factory_simple.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9b29aefa439faf6cf1352c33dabcff836f636a6c
--- /dev/null
+++ b/chromecast/browser/media/audio_manager_factory_simple.cc
@@ -0,0 +1,17 @@
+// Copyright 2015 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 "base/logging.h"
+
+namespace chromecast {
+namespace media {
+
+// Do not provide a factory. The statically-linked default implementation will
+// be used. See "src/media/audio/audio_manager.cc" for more detail.
+void SetPlatformAudioManagerFactory() {
+  VLOG(1) << "Using statically-linked default AudioManager.";
+}
+
+}  // namespace media
+}  // namespace chromecast