third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/stubs/mathlimits.h

Index: third_party/protobuf/src/google/protobuf/stubs/mathlimits.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/mathlimits.h b/third_party/protobuf/src/google/protobuf/stubs/mathlimits.h
index d98469404b8f78af1964c4858c9f33103ee1d516..70e47bff18cd74999fa62d1b63330798cae9b0ee 100644
--- a/third_party/protobuf/src/google/protobuf/stubs/mathlimits.h
+++ b/third_party/protobuf/src/google/protobuf/stubs/mathlimits.h
@@ -230,11 +230,11 @@ DECL_UNSIGNED_INT_LIMITS(unsigned long long int)
   static bool IsNegInf(const Type x) { return _fpclass(x) == _FPCLASS_NINF; }
 #else
 #define DECL_FP_LIMIT_FUNCS \
-  static bool IsFinite(const Type x) { return !isinf(x)  &&  !isnan(x); } \
+  static bool IsFinite(const Type x) { return !isinf(x) && !isnan(x); } \
   static bool IsNaN(const Type x) { return isnan(x); } \
   static bool IsInf(const Type x) { return isinf(x); } \
-  static bool IsPosInf(const Type x) { return isinf(x)  &&  x > 0; } \
-  static bool IsNegInf(const Type x) { return isinf(x)  &&  x < 0; }
+  static bool IsPosInf(const Type x) { return isinf(x) && x > 0; } \
+  static bool IsNegInf(const Type x) { return isinf(x) && x < 0; }
 #endif
 
 // We can't put floating-point constant values in the header here because