Load CMA backend from shared library

chromecast/media/base/decrypt_context_impl_clearkey.cc

 // 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 "chromecast/media/base/decrypt_context_impl_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) {
+DecryptContextImplClearKey::DecryptContextImplClearKey(
+    crypto::SymmetricKey* key)
+    : DecryptContextImpl(KEY_SYSTEM_CLEAR_KEY), key_(key) {
   CHECK(key);
 }
 
-DecryptContextClearKey::~DecryptContextClearKey() {
-}
+DecryptContextImplClearKey::~DecryptContextImplClearKey() {}
 
-crypto::SymmetricKey* DecryptContextClearKey::GetKey() const {
+crypto::SymmetricKey* DecryptContextImplClearKey::GetKey() const {
   return key_;
 }
 
 }  // namespace media
 }  // namespace chromecast