Fix problem where field trials using kExpirationYearInFuture could get disabled.

base/metrics/field_trial_unittest.cc

 // Copyright (c) 2012 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/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "base/rand_util.h"
 #include "base/stringprintf.h"
 #include "base/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 699 matching lines @@
   FieldTrial::ActiveGroups active_groups;
   FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
   EXPECT_TRUE(active_groups.empty());
 
   // Ensure the trial is not listed in the |StatesToString()| result.
   std::string states;
   FieldTrialList::StatesToString(&states);
   EXPECT_TRUE(states.empty());
 }
 
+TEST_F(FieldTrialTest, ExpirationYearNotExpired) {
+  const char kTrialName[] = "NotExpired";
+  const char kGroupName[] = "Group2";
+  const int kProbability = 100;
+  ASSERT_FALSE(FieldTrialList::TrialExists(kTrialName));
+
+  FieldTrial* trial =
+      FieldTrialList::FactoryGetFieldTrial(
+          kTrialName, kProbability, kDefaultGroupName,
+          FieldTrialList::kNoExpirationYear, 1, 1, NULL);
+  trial->AppendGroup(kGroupName, kProbability);
+  EXPECT_EQ(kGroupName, trial->group_name());
+}
 
 }  // namespace base