Update VideoDecode PPAPI structs to be consistent with media structures, part 1

ppapi/c/dev/ppp_video_decoder_dev.h

Index: ppapi/c/dev/ppp_video_decoder_dev.h
diff --git a/ppapi/c/dev/ppp_video_decoder_dev.h b/ppapi/c/dev/ppp_video_decoder_dev.h
index 3fb265cbf49d07149e400f2e376b983473769799..760a33bf7c2967be9c87c2a9ead43a9db720a7ba 100644
--- a/ppapi/c/dev/ppp_video_decoder_dev.h
+++ b/ppapi/c/dev/ppp_video_decoder_dev.h
@@ -36,7 +36,7 @@ struct PPP_VideoDecoder_Dev {
   //  |decoder| is pointer to the Pepper Video Decoder instance.
   //  |picture_buffer| points to the picture buffer that is no longer needed.
   void (*DismissPictureBuffer)(PP_Resource decoder,
-                               union PP_PictureData_Dev* picture_buffer);
+                               int32_t picture_buffer_id);
 
   // Callback function for decoder to deliver decoded pictures ready to be
   // displayed. Decoder expects the plugin to return the buffer back to the