Add Promises for EME (Chromium side)

media/base/browser_cdm_factory.h

 // 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.
 
 #ifndef MEDIA_BASE_BROWSER_CDM_FACTORY_H_
 #define MEDIA_BASE_BROWSER_CDM_FACTORY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "media/base/browser_cdm.h"
 #include "media/base/media_export.h"
-#include "media/base/media_keys.h"
 
 namespace media {
 
-class BrowserCdm;
-
 // Creates a BrowserCdm for |key_system|. Returns NULL if the CDM cannot be
 // created.
 // TODO(xhwang): Add ifdef for IPC based CDM.
 scoped_ptr<BrowserCdm> MEDIA_EXPORT
     CreateBrowserCdm(const std::string& key_system,
-                     const SessionCreatedCB& session_created_cb,
-                     const SessionMessageCB& session_message_cb,
-                     const SessionReadyCB& session_ready_cb,
-                     const SessionClosedCB& session_closed_cb,
-                     const SessionErrorCB& session_error_cb);
+                     const BrowserCdm::SessionCreatedCB& session_created_cb,
+                     const BrowserCdm::SessionMessageCB& session_message_cb,
+                     const BrowserCdm::SessionReadyCB& session_ready_cb,
+                     const BrowserCdm::SessionClosedCB& session_closed_cb,
+                     const BrowserCdm::SessionErrorCB& session_error_cb);
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BROWSER_CDM_FACTORY_H_