third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/util/internal/field_mask_utility.cc

 // 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 94 matching lines @@
     }
     if (i < path.size() && path[i] == '\"') {
       is_quoted = true;
     }
   }
   return result;
 }
 
 util::Status DecodeCompactFieldMaskPaths(StringPiece paths,
                                            PathSinkCallback path_sink) {
-  stack<string> prefix;
+  std::stack<string> prefix;
   int length = paths.length();
   int previous_position = 0;
   bool in_map_key = false;
   bool is_escaping = false;
   // Loops until 1 passed the end of the input to make the handle of the last
   // segment easier.
   for (int i = 0; i <= length; ++i) {
     if (i != length) {
       // Skips everything in a map key until we hit the end of it, which is
       // marked by an un-escaped '"' immediately followed by a ']'.
@@ skipping 90 matching lines @@
                           StrCat("Invalid FieldMask '", paths,
                                  "'. Cannot find matching ')' for all '('."));
   }
   return util::Status::OK;
 }
 
 }  // namespace converter
 }  // namespace util
 }  // namespace protobuf
 }  // namespace google