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diff --git a/third_party/abseil_cpp/absl/container/internal/hash_function_defaults.h b/third_party/abseil_cpp/absl/container/internal/hash_function_defaults.h
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index 0683422ad8..0000000000
--- a/third_party/abseil_cpp/absl/container/internal/hash_function_defaults.h
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-// Copyright 2018 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// Define the default Hash and Eq functions for SwissTable containers.
-//
-// std::hash<T> and std::equal_to<T> are not appropriate hash and equal
-// functions for SwissTable containers. There are two reasons for this.
-//
-// SwissTable containers are power of 2 sized containers:
-//
-// This means they use the lower bits of the hash value to find the slot for
-// each entry. The typical hash function for integral types is the identity.
-// This is a very weak hash function for SwissTable and any power of 2 sized
-// hashtable implementation which will lead to excessive collisions. For
-// SwissTable we use murmur3 style mixing to reduce collisions to a minimum.
-//
-// SwissTable containers support heterogeneous lookup:
-//
-// In order to make heterogeneous lookup work, hash and equal functions must be
-// polymorphic. At the same time they have to satisfy the same requirements the
-// C++ standard imposes on hash functions and equality operators. That is:
-//
-//   if hash_default_eq<T>(a, b) returns true for any a and b of type T, then
-//   hash_default_hash<T>(a) must equal hash_default_hash<T>(b)
-//
-// For SwissTable containers this requirement is relaxed to allow a and b of
-// any and possibly different types. Note that like the standard the hash and
-// equal functions are still bound to T. This is important because some type U
-// can be hashed by/tested for equality differently depending on T. A notable
-// example is `const char*`. `const char*` is treated as a c-style string when
-// the hash function is hash<std::string> but as a pointer when the hash
-// function is hash<void*>.
-//
-#ifndef ABSL_CONTAINER_INTERNAL_HASH_FUNCTION_DEFAULTS_H_
-#define ABSL_CONTAINER_INTERNAL_HASH_FUNCTION_DEFAULTS_H_
-
-#include <stdint.h>
-#include <cstddef>
-#include <memory>
-#include <string>
-#include <type_traits>
-
-#include "absl/base/config.h"
-#include "absl/hash/hash.h"
-#include "absl/strings/cord.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace container_internal {
-
-// The hash of an object of type T is computed by using absl::Hash.
-template <class T, class E = void>
-struct HashEq {
-  using Hash = absl::Hash<T>;
-  using Eq = std::equal_to<T>;
-};
-
-struct StringHash {
-  using is_transparent = void;
-
-  size_t operator()(absl::string_view v) const {
-    return absl::Hash<absl::string_view>{}(v);
-  }
-  size_t operator()(const absl::Cord& v) const {
-    return absl::Hash<absl::Cord>{}(v);
-  }
-};
-
-// Supports heterogeneous lookup for string-like elements.
-struct StringHashEq {
-  using Hash = StringHash;
-  struct Eq {
-    using is_transparent = void;
-    bool operator()(absl::string_view lhs, absl::string_view rhs) const {
-      return lhs == rhs;
-    }
-    bool operator()(const absl::Cord& lhs, const absl::Cord& rhs) const {
-      return lhs == rhs;
-    }
-    bool operator()(const absl::Cord& lhs, absl::string_view rhs) const {
-      return lhs == rhs;
-    }
-    bool operator()(absl::string_view lhs, const absl::Cord& rhs) const {
-      return lhs == rhs;
-    }
-  };
-};
-
-template <>
-struct HashEq<std::string> : StringHashEq {};
-template <>
-struct HashEq<absl::string_view> : StringHashEq {};
-template <>
-struct HashEq<absl::Cord> : StringHashEq {};
-
-// Supports heterogeneous lookup for pointers and smart pointers.
-template <class T>
-struct HashEq<T*> {
-  struct Hash {
-    using is_transparent = void;
-    template <class U>
-    size_t operator()(const U& ptr) const {
-      return absl::Hash<const T*>{}(HashEq::ToPtr(ptr));
-    }
-  };
-  struct Eq {
-    using is_transparent = void;
-    template <class A, class B>
-    bool operator()(const A& a, const B& b) const {
-      return HashEq::ToPtr(a) == HashEq::ToPtr(b);
-    }
-  };
-
- private:
-  static const T* ToPtr(const T* ptr) { return ptr; }
-  template <class U, class D>
-  static const T* ToPtr(const std::unique_ptr<U, D>& ptr) {
-    return ptr.get();
-  }
-  template <class U>
-  static const T* ToPtr(const std::shared_ptr<U>& ptr) {
-    return ptr.get();
-  }
-};
-
-template <class T, class D>
-struct HashEq<std::unique_ptr<T, D>> : HashEq<T*> {};
-template <class T>
-struct HashEq<std::shared_ptr<T>> : HashEq<T*> {};
-
-// This header's visibility is restricted.  If you need to access the default
-// hasher please use the container's ::hasher alias instead.
-//
-// Example: typename Hash = typename absl::flat_hash_map<K, V>::hasher
-template <class T>
-using hash_default_hash = typename container_internal::HashEq<T>::Hash;
-
-// This header's visibility is restricted.  If you need to access the default
-// key equal please use the container's ::key_equal alias instead.
-//
-// Example: typename Eq = typename absl::flat_hash_map<K, V, Hash>::key_equal
-template <class T>
-using hash_default_eq = typename container_internal::HashEq<T>::Eq;
-
-}  // namespace container_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_CONTAINER_INTERNAL_HASH_FUNCTION_DEFAULTS_H_