Load CMA backend from shared library

chromecast/media/base/decrypt_context_clearkey.cc

Index: chromecast/media/base/decrypt_context_clearkey.cc
diff --git a/chromecast/media/base/decrypt_context_clearkey.cc b/chromecast/media/base/decrypt_context_clearkey.cc
deleted file mode 100644
index 248cbb459c68b060a41d82e6535c67efe515c0f8..0000000000000000000000000000000000000000
--- a/chromecast/media/base/decrypt_context_clearkey.cc
+++ /dev/null
@@ -1,27 +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_clearkey.h"
-
-#include "base/logging.h"
-#include "crypto/symmetric_key.h"
-
-namespace chromecast {
-namespace media {
-
-DecryptContextClearKey::DecryptContextClearKey(crypto::SymmetricKey* key)
-    : DecryptContext(KEY_SYSTEM_CLEAR_KEY),
-      key_(key) {
-  CHECK(key);
-}
-
-DecryptContextClearKey::~DecryptContextClearKey() {
-}
-
-crypto::SymmetricKey* DecryptContextClearKey::GetKey() const {
-  return key_;
-}
-
-}  // namespace media
-}  // namespace chromecast