Encrypted Media: Use uint32 for systemCode in SessionError.

content/renderer/pepper/content_decryptor_delegate.cc

 // Copyright (c) 2012 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/pepper/content_decryptor_delegate.h"
 
 #include "base/callback_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/numerics/safe_conversions.h"
@@ skipping 609 matching lines @@
 
 void ContentDecryptorDelegate::OnSessionClosed(uint32 session_id) {
   if (session_closed_cb_.is_null())
     return;
 
   session_closed_cb_.Run(session_id);
 }
 
 void ContentDecryptorDelegate::OnSessionError(uint32 session_id,
                                               int32_t media_error,
-                                              int32_t system_code) {
+                                              uint32_t system_code) {
   if (session_error_cb_.is_null())
     return;
 
   session_error_cb_.Run(session_id,
                         static_cast<media::MediaKeys::KeyError>(media_error),
                         system_code);
 }
 
 void ContentDecryptorDelegate::DecoderInitializeDone(
      PP_DecryptorStreamType decoder_type,
@@ skipping 414 matching lines @@
     const media::Decryptor::AudioBuffers empty_frames;
     audio_decode_cb_.ResetAndReturn().Run(media::Decryptor::kError,
                                           empty_frames);
   }
 
   if (!video_decode_cb_.is_null())
     video_decode_cb_.ResetAndReturn().Run(media::Decryptor::kError, NULL);
 }
 
 }  // namespace content