Fix in process PPAPI decryption.

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 @@
   void KeyAdded(const std::string& key_system,
                 const std::string& session_id);
   void KeyMessage(const std::string& key_system,
                   const std::string& session_id,
                   pp::Buffer_Dev message,
                   const std::string& default_url);
   void KeyError(const std::string& key_system,
                 const std::string& session_id,
                 int32_t media_error,
                 int32_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);
   void DecoderDeinitializeDone(PP_DecryptorStreamType decoder_type,
                                uint32_t request_id);
   void DecoderResetDone(PP_DecryptorStreamType decoder_type,
                         uint32_t request_id);
+
+  // The plugin must not hold a reference to the encrypted buffer resource
+  // provided to DecryptAndDecode() when it calls this method. The browser will
+  // reuse the buffer in a subsequent DecryptAndDecode() call.
   void DeliverFrame(pp::Buffer_Dev decrypted_frame,
                     const PP_DecryptedFrameInfo& decrypted_frame_info);
+
+  // The plugin must not hold a reference to the encrypted buffer resource
+  // provided to DecryptAndDecode() when it calls this method. The browser will
+  // reuse the buffer in a subsequent DecryptAndDecode() call.
   void DeliverSamples(pp::Buffer_Dev audio_frames,
                       const PP_DecryptedBlockInfo& decrypted_block_info);
 
  private:
   InstanceHandle associated_instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_