third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/objectivec/GPBWireFormat.h

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 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 35 matching lines @@
 enum {
   GPBWireFormatMessageSetItem = 1,
   GPBWireFormatMessageSetTypeId = 2,
   GPBWireFormatMessageSetMessage = 3
 };
 
 uint32_t GPBWireFormatMakeTag(uint32_t fieldNumber, GPBWireFormat wireType)
     __attribute__((const));
 GPBWireFormat GPBWireFormatGetTagWireType(uint32_t tag) __attribute__((const));
 uint32_t GPBWireFormatGetTagFieldNumber(uint32_t tag) __attribute__((const));
+BOOL GPBWireFormatIsValidTag(uint32_t tag) __attribute__((const));
 
 GPBWireFormat GPBWireFormatForType(GPBDataType dataType, BOOL isPacked)
     __attribute__((const));
 
 #define GPBWireFormatMessageSetItemTag \
   (GPBWireFormatMakeTag(GPBWireFormatMessageSetItem, GPBWireFormatStartGroup))
 #define GPBWireFormatMessageSetItemEndTag \
   (GPBWireFormatMakeTag(GPBWireFormatMessageSetItem, GPBWireFormatEndGroup))
 #define GPBWireFormatMessageSetTypeIdTag \
   (GPBWireFormatMakeTag(GPBWireFormatMessageSetTypeId, GPBWireFormatVarint))
 #define GPBWireFormatMessageSetMessageTag               \
   (GPBWireFormatMakeTag(GPBWireFormatMessageSetMessage, \
                         GPBWireFormatLengthDelimited))
 
 NS_ASSUME_NONNULL_END
 
 CF_EXTERN_C_END