Encrypted Media: Use uint32 for systemCode in SessionError.

content/renderer/media/cdm_session_adapter.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 "content/renderer/media/cdm_session_adapter.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "content/renderer/media/crypto/content_decryption_module_factory.h"
@@ skipping 111 matching lines @@
 void CdmSessionAdapter::OnSessionClosed(uint32 session_id) {
   WebContentDecryptionModuleSessionImpl* session = GetSession(session_id);
   DLOG_IF(WARNING, !session) << __FUNCTION__ << " for unknown session "
                              << session_id;
   if (session)
     session->OnSessionClosed();
 }
 
 void CdmSessionAdapter::OnSessionError(uint32 session_id,
                                        media::MediaKeys::KeyError error_code,
-                                       int system_code) {
+                                       uint32 system_code) {
   WebContentDecryptionModuleSessionImpl* session = GetSession(session_id);
   DLOG_IF(WARNING, !session) << __FUNCTION__ << " for unknown session "
                              << session_id;
   if (session)
     session->OnSessionError(error_code, system_code);
 }
 
 WebContentDecryptionModuleSessionImpl* CdmSessionAdapter::GetSession(
     uint32 session_id) {
   // Since session objects may get garbage collected, it is possible that there
   // are events coming back from the CDM and the session has been unregistered.
   // We can not tell if the CDM is firing events at sessions that never existed.
   SessionMap::iterator session = sessions_.find(session_id);
   return (session != sessions_.end()) ? session->second : NULL;
 }
 
 }  // namespace content