libchrome: Several upstreamable fixes from libchrome

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>
 
@@ skipping 170 matching lines @@
 // Dst range is statically determined to contain Src: Nothing to check.
 template <typename Dst,
           typename Src,
           IntegerRepresentation DstSign,
           IntegerRepresentation SrcSign>
 struct DstRangeRelationToSrcRangeImpl<Dst,
                                       Src,
                                       DstSign,
                                       SrcSign,
                                       NUMERIC_RANGE_CONTAINED> {
-  static constexpr RangeConstraint Check(Src value) { return RANGE_VALID; }
+  static constexpr RangeConstraint Check(Src /*value*/) { return RANGE_VALID; }
 };
 
 // Signed to signed narrowing: Both the upper and lower boundaries may be
 // exceeded.
 template <typename Dst, typename Src>
 struct DstRangeRelationToSrcRangeImpl<Dst,
                                       Src,
                                       INTEGER_REPRESENTATION_SIGNED,
                                       INTEGER_REPRESENTATION_SIGNED,
                                       NUMERIC_RANGE_NOT_CONTAINED> {
@@ skipping 54 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_