Fix in process PPAPI decryption.

ppapi/cpp/private/content_decryptor_private.h

Index: ppapi/cpp/private/content_decryptor_private.h
diff --git a/ppapi/cpp/private/content_decryptor_private.h b/ppapi/cpp/private/content_decryptor_private.h
index 629540abdb51afbf22bcd255341a896013b6ec81..4e93657b3504d7999b12d9e4cd43efd95f21fe38 100644
--- a/ppapi/cpp/private/content_decryptor_private.h
+++ b/ppapi/cpp/private/content_decryptor_private.h
@@ -68,8 +68,13 @@ class ContentDecryptor_Private {
                 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);
@@ -77,8 +82,16 @@ class ContentDecryptor_Private {
                                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);