Update double-conversion and reapply NO_LINTs.

runtime/third_party/double-conversion/src/bignum.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 86 matching lines @@
   }
   return result;
 }
 
 
 void Bignum::AssignDecimalString(Vector<const char> value) {
   // 2^64 = 18446744073709551616 > 10^19
   const int kMaxUint64DecimalDigits = 19;
   Zero();
   int length = value.length();
-  int pos = 0;
+  unsigned int pos = 0;
   // Let's just say that each digit needs 4 bits.
   while (length >= kMaxUint64DecimalDigits) {
     uint64_t digits = ReadUInt64(value, pos, kMaxUint64DecimalDigits);
     pos += kMaxUint64DecimalDigits;
     length -= kMaxUint64DecimalDigits;
     MultiplyByPowerOfTen(kMaxUint64DecimalDigits);
     AddUInt64(digits);
   }
   uint64_t digits = ReadUInt64(value, pos, length);
   MultiplyByPowerOfTen(length);
@@ skipping 639 matching lines @@
     if (borrow == 0) return;
     Chunk difference = bigits_[i] - borrow;
     bigits_[i] = difference & kBigitMask;
     borrow = difference >> (kChunkSize - 1);
   }
   Clamp();
 }
 
 
 }  // namespace double_conversion