Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/stubs/int128.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 127 matching lines @@
 }
 
 std::ostream& operator<<(std::ostream& o, const uint128& b) {
   std::ios_base::fmtflags flags = o.flags();
 
   // Select a divisor which is the largest power of the base < 2^64.
   uint128 div;
   std::streamsize div_base_log;
   switch (flags & std::ios::basefield) {
     case std::ios::hex:
-      div = static_cast<uint64>(GOOGLE_ULONGLONG(0x1000000000000000));  // 16^15
+      div = GOOGLE_ULONGLONG(0x1000000000000000);  // 16^15
       div_base_log = 15;
       break;
     case std::ios::oct:
-      div = static_cast<uint64>(GOOGLE_ULONGLONG(01000000000000000000000));  // 8^21
+      div = GOOGLE_ULONGLONG(01000000000000000000000);  // 8^21
       div_base_log = 21;
       break;
     default:  // std::ios::dec
-      div = static_cast<uint64>(GOOGLE_ULONGLONG(10000000000000000000));  // 10^19
+      div = GOOGLE_ULONGLONG(10000000000000000000);  // 10^19
       div_base_log = 19;
       break;
   }
 
   // Now piece together the uint128 representation from three chunks of
   // the original value, each less than "div" and therefore representable
   // as a uint64.
   std::ostringstream os;
   std::ios_base::fmtflags copy_mask =
       std::ios::basefield | std::ios::showbase | std::ios::uppercase;
@@ skipping 25 matching lines @@
                  width - rep.size(), o.fill());
     }
   }
 
   // Stream the final representation in a single "<<" call.
   return o << rep;
 }
 
 }  // namespace protobuf
 }  // namespace google