run iwyu on base!

base/metrics/field_trial.cc

 // Copyright (c) 2010 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.
 
-#include "base/metrics/field_trial.h"
+#include <stdbool.h>
+#include <stddef.h>
+#include <map>
+#include <string>
+#include <utility>
 
 #include "base/logging.h"
+#include "base/metrics/field_trial.h"
 #include "base/rand_util.h"
 #include "base/stringprintf.h"
+#include "base/synchronization/lock.h"
+#include "base/time.h"
 #include "base/utf_string_conversions.h"
 
 namespace base {
 
 // static
 const int FieldTrial::kNotFinalized = -1;
 
 // static
 const int FieldTrial::kDefaultGroupNumber = 0;
 
@@ skipping 243 matching lines @@
 }
 
 FieldTrial* FieldTrialList::PreLockedFind(const std::string& name) {
   RegistrationList::iterator it = registered_.find(name);
   if (registered_.end() == it)
     return NULL;
   return it->second;
 }
 
 }  // namespace base