media: Move CdmInitializedPromise to media/.

media/base/cdm_initialized_promise.cc

 // 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 "content/renderer/media/crypto/cdm_initialized_promise.h"
+#include "media/base/cdm_initialized_promise.h"
 
-namespace content {
+namespace media {
 
-CdmInitializedPromise::CdmInitializedPromise(
-    const media::CdmCreatedCB& cdm_created_cb,
-    scoped_ptr<media::MediaKeys> cdm)
+CdmInitializedPromise::CdmInitializedPromise(const CdmCreatedCB& cdm_created_cb,
+                                             scoped_ptr<MediaKeys> cdm)
     : cdm_created_cb_(cdm_created_cb), cdm_(cdm.Pass()) {
 }
 
 CdmInitializedPromise::~CdmInitializedPromise() {
 }
 
 void CdmInitializedPromise::resolve() {
   MarkPromiseSettled();
   cdm_created_cb_.Run(cdm_.Pass(), "");
 }
 
-void CdmInitializedPromise::reject(media::MediaKeys::Exception exception_code,
+void CdmInitializedPromise::reject(MediaKeys::Exception exception_code,
                                    uint32 system_code,
                                    const std::string& error_message) {
   MarkPromiseSettled();
   cdm_created_cb_.Run(nullptr, error_message);
+  // Usually after this |this| (and the |cdm_| within it) will be destroyed.
 }
 
-}  // namespace content
+}  // namespace media