third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/util/field_comparator.cc

Index: third_party/protobuf/src/google/protobuf/util/field_comparator.cc
diff --git a/third_party/protobuf/src/google/protobuf/util/field_comparator.cc b/third_party/protobuf/src/google/protobuf/util/field_comparator.cc
index 60b8b8a5ab85840ce2389dfce354b4b66f9c3bcd..a1a56ee6749a82325b1484c84d49ed48bbb98bbe 100644
--- a/third_party/protobuf/src/google/protobuf/util/field_comparator.cc
+++ b/third_party/protobuf/src/google/protobuf/util/field_comparator.cc
@@ -189,7 +189,7 @@ bool DefaultFieldComparator::CompareDoubleOrFloat(const FieldDescriptor& field,
       return MathUtil::AlmostEquals(value_1, value_2);
     } else {
       // Use user-provided fraction and margin. Since they are stored as
-      // doubles, we explicitely cast them to types of values provided. This
+      // doubles, we explicitly cast them to types of values provided. This
       // is very likely to fail if provided values are not numeric.
       return MathUtil::WithinFractionOrMargin(
           value_1, value_2, static_cast<T>(tolerance->fraction),