Include type_traits in safe_conversions_impl

base/numerics/safe_conversions_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_NUMERICS_SAFE_CONVERSIONS_IMPL_H_
 #define BASE_NUMERICS_SAFE_CONVERSIONS_IMPL_H_
 
 #include <limits.h>
 #include <stdint.h>
 
 #include <climits>
 #include <limits>
+#include <type_traits>
 
 namespace base {
 namespace internal {
 
 // The std library doesn't provide a binary max_exponent for integers, however
 // we can compute one by adding one to the number of non-sign bits. This allows
 // for accurate range comparisons between floating point and integer types.
 template <typename NumericType>
 struct MaxExponent {
   static_assert(std::is_arithmetic<NumericType>::value,
@@ skipping 233 matching lines @@
                 "Argument must be numeric.");
   static_assert(std::numeric_limits<Dst>::is_specialized,
                 "Result must be numeric.");
   return DstRangeRelationToSrcRangeImpl<Dst, Src>::Check(value);
 }
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_NUMERICS_SAFE_CONVERSIONS_IMPL_H_