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diff --git a/chromium/base/util/ranges/iterator.h b/chromium/base/util/ranges/iterator.h
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+++ b/chromium/base/util/ranges/iterator.h
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+// Copyright 2020 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_UTIL_RANGES_ITERATOR_H_
+#define BASE_UTIL_RANGES_ITERATOR_H_
+
+#include <iterator>
+
+namespace util {
+namespace ranges {
+
+// Simplified implementation of C++20's std::ranges::begin.
+// As opposed to std::ranges::begin, this implementation does not prefer a
+// member begin() over a free standing begin(), does not check whether begin()
+// returns an iterator, does not inhibit ADL and is not constexpr.
+//
+// Reference: https://wg21.link/range.access.begin
+template <typename Range>
+decltype(auto) begin(Range&& range) {
+  using std::begin;
+  return begin(std::forward<Range>(range));
+}
+
+// Simplified implementation of C++20's std::ranges::end.
+// As opposed to std::ranges::end, this implementation does not prefer a
+// member end() over a free standing end(), does not check whether end()
+// returns an iterator, does not inhibit ADL and is not constexpr.
+//
+// Reference: - https://wg21.link/range.access.end
+template <typename Range>
+decltype(auto) end(Range&& range) {
+  using std::end;
+  return end(std::forward<Range>(range));
+}
+
+}  // namespace ranges
+}  // namespace util
+
+#endif  // BASE_UTIL_RANGES_ITERATOR_H_