media: Rename MediaKeys to ContentDecryptionModule

media/base/content_decryption_module.cc

Index: media/base/content_decryption_module.cc
diff --git a/media/base/content_decryption_module.cc b/media/base/content_decryption_module.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a3c21d6e1d39d2edf66bf49555a881088a5f8f29
--- /dev/null
+++ b/media/base/content_decryption_module.cc
@@ -0,0 +1,27 @@
+// Copyright 2013 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 "media/base/content_decryption_module.h"
+
+namespace media {
+
+ContentDecryptionModule::ContentDecryptionModule() {}
+
+ContentDecryptionModule::~ContentDecryptionModule() {}
+
+CdmContext* ContentDecryptionModule::GetCdmContext() {
+  return nullptr;
+}
+
+void ContentDecryptionModule::DeleteOnCorrectThread() const {
+  delete this;
+}
+
+// static
+void ContentDecryptionModuleTraits::Destruct(
+    const ContentDecryptionModule* cdm) {
+  cdm->DeleteOnCorrectThread();
+}
+
+}  // namespace media