Encrypted Media: Use uint32 for systemCode in SessionError.

content/renderer/media/android/proxy_media_keys.cc

 // 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 "content/renderer/media/android/proxy_media_keys.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 95 matching lines @@
 void ProxyMediaKeys::OnSessionReady(uint32 session_id) {
   session_ready_cb_.Run(session_id);
 }
 
 void ProxyMediaKeys::OnSessionClosed(uint32 session_id) {
   session_closed_cb_.Run(session_id);
 }
 
 void ProxyMediaKeys::OnSessionError(uint32 session_id,
                                     media::MediaKeys::KeyError error_code,
-                                    int system_code) {
+                                    uint32 system_code) {
   session_error_cb_.Run(session_id, error_code, system_code);
 }
 
 }  // namespace content