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diff --git a/third_party/abseil_cpp/absl/random/bit_gen_ref.h b/third_party/abseil_cpp/absl/random/bit_gen_ref.h
deleted file mode 100644
index 9555460fd4..0000000000
--- a/third_party/abseil_cpp/absl/random/bit_gen_ref.h
+++ /dev/null
@@ -1,181 +0,0 @@
-//
-// 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.
-//
-// -----------------------------------------------------------------------------
-// File: bit_gen_ref.h
-// -----------------------------------------------------------------------------
-//
-// This header defines a bit generator "reference" class, for use in interfaces
-// that take both Abseil (e.g. `absl::BitGen`) and standard library (e.g.
-// `std::mt19937`) bit generators.
-
-#ifndef ABSL_RANDOM_BIT_GEN_REF_H_
-#define ABSL_RANDOM_BIT_GEN_REF_H_
-
-#include "absl/base/internal/fast_type_id.h"
-#include "absl/base/macros.h"
-#include "absl/meta/type_traits.h"
-#include "absl/random/internal/distribution_caller.h"
-#include "absl/random/internal/fast_uniform_bits.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace random_internal {
-
-template <typename URBG, typename = void, typename = void, typename = void>
-struct is_urbg : std::false_type {};
-
-template <typename URBG>
-struct is_urbg<
-    URBG,
-    absl::enable_if_t<std::is_same<
-        typename URBG::result_type,
-        typename std::decay<decltype((URBG::min)())>::type>::value>,
-    absl::enable_if_t<std::is_same<
-        typename URBG::result_type,
-        typename std::decay<decltype((URBG::max)())>::type>::value>,
-    absl::enable_if_t<std::is_same<
-        typename URBG::result_type,
-        typename std::decay<decltype(std::declval<URBG>()())>::type>::value>>
-    : std::true_type {};
-
-template <typename>
-struct DistributionCaller;
-class MockHelpers;
-
-}  // namespace random_internal
-
-// -----------------------------------------------------------------------------
-// absl::BitGenRef
-// -----------------------------------------------------------------------------
-//
-// `absl::BitGenRef` is a type-erasing class that provides a generator-agnostic
-// non-owning "reference" interface for use in place of any specific uniform
-// random bit generator (URBG). This class may be used for both Abseil
-// (e.g. `absl::BitGen`, `absl::InsecureBitGen`) and Standard library (e.g
-// `std::mt19937`, `std::minstd_rand`) bit generators.
-//
-// Like other reference classes, `absl::BitGenRef` does not own the
-// underlying bit generator, and the underlying instance must outlive the
-// `absl::BitGenRef`.
-//
-// `absl::BitGenRef` is particularly useful when used with an
-// `absl::MockingBitGen` to test specific paths in functions which use random
-// values.
-//
-// Example:
-//    void TakesBitGenRef(absl::BitGenRef gen) {
-//      int x = absl::Uniform<int>(gen, 0, 1000);
-//    }
-//
-class BitGenRef {
-  // SFINAE to detect whether the URBG type includes a member matching
-  // bool InvokeMock(base_internal::FastTypeIdType, void*, void*).
-  //
-  // These live inside BitGenRef so that they have friend access
-  // to MockingBitGen. (see similar methods in DistributionCaller).
-  template <template <class...> class Trait, class AlwaysVoid, class... Args>
-  struct detector : std::false_type {};
-  template <template <class...> class Trait, class... Args>
-  struct detector<Trait, absl::void_t<Trait<Args...>>, Args...>
-      : std::true_type {};
-
-  template <class T>
-  using invoke_mock_t = decltype(std::declval<T*>()->InvokeMock(
-      std::declval<base_internal::FastTypeIdType>(), std::declval<void*>(),
-      std::declval<void*>()));
-
-  template <typename T>
-  using HasInvokeMock = typename detector<invoke_mock_t, void, T>::type;
-
- public:
-  BitGenRef(const BitGenRef&) = default;
-  BitGenRef(BitGenRef&&) = default;
-  BitGenRef& operator=(const BitGenRef&) = default;
-  BitGenRef& operator=(BitGenRef&&) = default;
-
-  template <typename URBG, typename absl::enable_if_t<
-                               (!std::is_same<URBG, BitGenRef>::value &&
-                                random_internal::is_urbg<URBG>::value &&
-                                !HasInvokeMock<URBG>::value)>* = nullptr>
-  BitGenRef(URBG& gen)  // NOLINT
-      : t_erased_gen_ptr_(reinterpret_cast<uintptr_t>(&gen)),
-        mock_call_(NotAMock),
-        generate_impl_fn_(ImplFn<URBG>) {}
-
-  template <typename URBG,
-            typename absl::enable_if_t<(!std::is_same<URBG, BitGenRef>::value &&
-                                        random_internal::is_urbg<URBG>::value &&
-                                        HasInvokeMock<URBG>::value)>* = nullptr>
-  BitGenRef(URBG& gen)  // NOLINT
-      : t_erased_gen_ptr_(reinterpret_cast<uintptr_t>(&gen)),
-        mock_call_(&MockCall<URBG>),
-        generate_impl_fn_(ImplFn<URBG>) {}
-
-  using result_type = uint64_t;
-
-  static constexpr result_type(min)() {
-    return (std::numeric_limits<result_type>::min)();
-  }
-
-  static constexpr result_type(max)() {
-    return (std::numeric_limits<result_type>::max)();
-  }
-
-  result_type operator()() { return generate_impl_fn_(t_erased_gen_ptr_); }
-
- private:
-  using impl_fn = result_type (*)(uintptr_t);
-  using mock_call_fn = bool (*)(uintptr_t, base_internal::FastTypeIdType, void*,
-                                void*);
-
-  template <typename URBG>
-  static result_type ImplFn(uintptr_t ptr) {
-    // Ensure that the return values from operator() fill the entire
-    // range promised by result_type, min() and max().
-    absl::random_internal::FastUniformBits<result_type> fast_uniform_bits;
-    return fast_uniform_bits(*reinterpret_cast<URBG*>(ptr));
-  }
-
-  // Get a type-erased InvokeMock pointer.
-  template <typename URBG>
-  static bool MockCall(uintptr_t gen_ptr, base_internal::FastTypeIdType type,
-                       void* result, void* arg_tuple) {
-    return reinterpret_cast<URBG*>(gen_ptr)->InvokeMock(type, result,
-                                                        arg_tuple);
-  }
-  static bool NotAMock(uintptr_t, base_internal::FastTypeIdType, void*, void*) {
-    return false;
-  }
-
-  inline bool InvokeMock(base_internal::FastTypeIdType type, void* args_tuple,
-                         void* result) {
-    if (mock_call_ == NotAMock) return false;  // avoids an indirect call.
-    return mock_call_(t_erased_gen_ptr_, type, args_tuple, result);
-  }
-
-  uintptr_t t_erased_gen_ptr_;
-  mock_call_fn mock_call_;
-  impl_fn generate_impl_fn_;
-
-  template <typename>
-  friend struct ::absl::random_internal::DistributionCaller;  // for InvokeMock
-  friend class ::absl::random_internal::MockHelpers;          // for InvokeMock
-};
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_RANDOM_BIT_GEN_REF_H_