Load CMA backend from shared library

chromecast/media/base/decrypt_context.cc

Index: chromecast/media/base/decrypt_context.cc
diff --git a/chromecast/media/base/decrypt_context.cc b/chromecast/media/base/decrypt_context.cc
deleted file mode 100644
index 38da3af7c06bba880ddd69c0dbce3dcc4bdbbeb7..0000000000000000000000000000000000000000
--- a/chromecast/media/base/decrypt_context.cc
+++ /dev/null
@@ -1,22 +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/base/decrypt_context.h"
-
-namespace chromecast {
-namespace media {
-
-DecryptContext::DecryptContext(CastKeySystem key_system)
-    : key_system_(key_system) {
-}
-
-DecryptContext::~DecryptContext() {
-}
-
-crypto::SymmetricKey* DecryptContext::GetKey() const {
-  return NULL;
-}
-
-}  // namespace media
-}  // namespace chromecast