Replace RE2 import with a dependency

third_party/re2/util/benchmark.h

-// Copyright 2009 The RE2 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 RE2_UTIL_BENCHMARK_H__
-#define RE2_UTIL_BENCHMARK_H__
-
-namespace testing {
-struct Benchmark {
-  const char* name;
-  void (*fn)(int);
-  void (*fnr)(int, int);
-  int lo;
-  int hi;
-  int threadlo;
-  int threadhi;
-  
-  void Register();
-  Benchmark(const char* name, void (*f)(int)) { Clear(name); fn = f; Register(); }
-  Benchmark(const char* name, void (*f)(int, int), int l, int h) { Clear(name); fnr = f; lo = l; hi = h; Register(); }
-  void Clear(const char* n) { name = n; fn = 0; fnr = 0; lo = 0; hi = 0; threadlo = 0; threadhi = 0; }
-  Benchmark* ThreadRange(int lo, int hi) { threadlo = lo; threadhi = hi; return this; }
-};
-}  // namespace testing
-
-void SetBenchmarkBytesProcessed(long long);
-void StopBenchmarkTiming();
-void StartBenchmarkTiming();
-void BenchmarkMemoryUsage();
-void SetBenchmarkItemsProcessed(int);
-
-int NumCPUs();
-
-#define BENCHMARK(f) \
-        ::testing::Benchmark* _benchmark_##f = (new ::testing::Benchmark(#f, f))
-
-#define BENCHMARK_RANGE(f, lo, hi) \
-        ::testing::Benchmark* _benchmark_##f = \
-        (new ::testing::Benchmark(#f, f, lo, hi))
-
-#endif  // RE2_UTIL_BENCHMARK_H__