Encrypted Media: Use uint32 for systemCode in SessionError.

ppapi/cpp/private/content_decryptor_private.h

 // 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.
 
 #ifndef PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 #define PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 
 #include "ppapi/c/private/pp_content_decryptor.h"
 #include "ppapi/c/private/ppb_content_decryptor_private.h"
 #include "ppapi/c/private/ppp_content_decryptor_private.h"
@@ skipping 50 matching lines @@
   // PPB_ContentDecryptor_Private methods for passing data from the decryptor
   // to the browser.
   void SessionCreated(uint32_t session_id, const std::string& web_session_id);
   void SessionMessage(uint32_t session_id,
                       pp::VarArrayBuffer message,
                       const std::string& default_url);
   void SessionReady(uint32_t session_id);
   void SessionClosed(uint32_t session_id);
   void SessionError(uint32_t session_id,
                     int32_t media_error,
-                    int32_t system_code);
+                    uint32_t system_code);
 
   // The plugin must not hold a reference to the encrypted buffer resource
   // provided to Decrypt() when it calls this method. The browser will reuse
   // the buffer in a subsequent Decrypt() call.
   void DeliverBlock(pp::Buffer_Dev decrypted_block,
                     const PP_DecryptedBlockInfo& decrypted_block_info);
 
   void DecoderInitializeDone(PP_DecryptorStreamType decoder_type,
                              uint32_t request_id,
                              bool status);
@@ skipping 14 matching lines @@
   void DeliverSamples(pp::Buffer_Dev audio_frames,
                       const PP_DecryptedSampleInfo& decrypted_sample_info);
 
  private:
   InstanceHandle associated_instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_