Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/ruby/ext/google/protobuf_c/protobuf.h

 // Protocol Buffers - Google's data interchange format
 // Copyright 2014 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 94 matching lines @@
 struct DescriptorPool {
   upb_symtab* symtab;
 };
 
 struct Descriptor {
   const upb_msgdef* msgdef;
   MessageLayout* layout;
   VALUE klass;  // begins as nil
   const upb_handlers* fill_handlers;
   const upb_pbdecodermethod* fill_method;
+  const upb_json_parsermethod* json_fill_method;
   const upb_handlers* pb_serialize_handlers;
   const upb_handlers* json_serialize_handlers;
+  const upb_handlers* json_serialize_handlers_preserve;
   // Handlers hold type class references for sub-message fields directly in some
   // cases. We need to keep these rooted because they might otherwise be
   // collected.
   VALUE typeclass_references;
 };
 
 struct FieldDescriptor {
   const upb_fielddef* fielddef;
 };
 
@@ skipping 363 matching lines @@
 VALUE Message_deep_copy(VALUE _self);
 VALUE Message_eq(VALUE _self, VALUE _other);
 VALUE Message_hash(VALUE _self);
 VALUE Message_inspect(VALUE _self);
 VALUE Message_index(VALUE _self, VALUE field_name);
 VALUE Message_index_set(VALUE _self, VALUE field_name, VALUE value);
 VALUE Message_descriptor(VALUE klass);
 VALUE Message_decode(VALUE klass, VALUE data);
 VALUE Message_encode(VALUE klass, VALUE msg_rb);
 VALUE Message_decode_json(VALUE klass, VALUE data);
-VALUE Message_encode_json(VALUE klass, VALUE msg_rb);
+VALUE Message_encode_json(int argc, VALUE* argv, VALUE klass);
 
 VALUE Google_Protobuf_deep_copy(VALUE self, VALUE obj);
 
 VALUE build_module_from_enumdesc(EnumDescriptor* enumdef);
 VALUE enum_lookup(VALUE self, VALUE number);
 VALUE enum_resolve(VALUE self, VALUE sym);
 
 const upb_pbdecodermethod *new_fillmsg_decodermethod(
     Descriptor* descriptor, const void *owner);
 
@@ skipping 16 matching lines @@
 
 #define CHECK_UPB(code, msg) do {                                             \
     upb_status status = UPB_STATUS_INIT;                                      \
     code;                                                                     \
     check_upb_status(&status, msg);                                           \
 } while (0)
 
 extern ID descriptor_instancevar_interned;
 
 #endif  // __GOOGLE_PROTOBUF_RUBY_PROTOBUF_H__