Update copy of safe_math_impl.h to take a fix from upstream:

third_party/base/numerics/safe_math_impl.h

Index: third_party/base/numerics/safe_math_impl.h
diff --git a/third_party/base/numerics/safe_math_impl.h b/third_party/base/numerics/safe_math_impl.h
index f9a4a715700ad00bd7dec0d77f7fe8aa6de84bdd..14897202bd4ab58f529407024dacced928a7ed4a 100644
--- a/third_party/base/numerics/safe_math_impl.h
+++ b/third_party/base/numerics/safe_math_impl.h
@@ -178,8 +178,8 @@ typename enable_if<std::numeric_limits<T>::is_integer&& std::numeric_limits<
                        T>::is_signed&&(sizeof(T) * 2 > sizeof(uintmax_t)),
                    T>::type
 CheckedMul(T x, T y, RangeConstraint* validity) {
-  // if either side is zero then the result will be zero.
-  if (!(x || y)) {
+  // If either side is zero then the result will be zero.
+  if (!x || !y) {
     return RANGE_VALID;
 
   } else if (x > 0) {