Encrypted Media: Use uint32 for systemCode in SessionError.

content/renderer/media/crypto/proxy_decryptor.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/crypto/proxy_decryptor.h"
 
 #include <cstring>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 222 matching lines @@
     persistent_sessions_.erase(it);
     OnSessionError(
         session_id, media::MediaKeys::kUnknownError, kSessionClosedSystemCode);
   }
 
   sessions_.erase(session_id);
 }
 
 void ProxyDecryptor::OnSessionError(uint32 session_id,
                                     media::MediaKeys::KeyError error_code,
-                                    int system_code) {
+                                    uint32 system_code) {
   // Assumes that OnSessionCreated() has been called before this.
   key_error_cb_.Run(LookupWebSessionId(session_id), error_code, system_code);
 }
 
 uint32 ProxyDecryptor::LookupSessionId(const std::string& session_id) const {
   for (SessionIdMap::const_iterator it = sessions_.begin();
        it != sessions_.end();
        ++it) {
     if (it->second == session_id)
       return it->first;
   }
 
   // If |session_id| is null, then use the single reference id.
   if (session_id.empty() && sessions_.size() == 1)
     return sessions_.begin()->first;
 
   return kInvalidSessionId;
 }
 
 const std::string& ProxyDecryptor::LookupWebSessionId(uint32 session_id) const {
   DCHECK_NE(session_id, kInvalidSessionId);
 
   // Session may not exist if error happens during GenerateKeyRequest().
   SessionIdMap::const_iterator it = sessions_.find(session_id);
   return (it != sessions_.end()) ? it->second : base::EmptyString();
 }
 
 }  // namespace content