metrics: call LoginState::Shutdown() at end of unit tests

chrome/browser/metrics/metrics_log_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 "chrome/browser/metrics/metrics_log.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/basictypes.h"
@@ skipping 105 matching lines @@
     MetricsService::RegisterPrefs(prefs_.registry());
 #if defined(OS_CHROMEOS)
     // TODO(blundell): Remove this code once MetricsService no longer creates
     // ChromeOSMetricsProvider. Also remove the #include of login_state.h
     // (http://crbug.com/375776)
     if (!chromeos::LoginState::IsInitialized())
       chromeos::LoginState::Initialize();
 #endif  // defined(OS_CHROMEOS)
   }
 
+  virtual ~MetricsLogTest() {
+#if defined(OS_CHROMEOS)
+    // TODO(blundell): Remove this code once MetricsService no longer creates
+    // ChromeOSMetricsProvider.
+    chromeos::LoginState::Shutdown();
+#endif  // defined(OS_CHROMEOS)
+  }
+
  protected:
   // Check that the values in |system_values| correspond to the test data
   // defined at the top of this file.
   void CheckSystemProfile(const metrics::SystemProfileProto& system_profile) {
     EXPECT_EQ(kInstallDateExpected, system_profile.install_date());
     EXPECT_EQ(kEnabledDateExpected, system_profile.uma_enabled_date());
 
     ASSERT_EQ(arraysize(kFieldTrialIds) + arraysize(kSyntheticTrials),
               static_cast<size_t>(system_profile.field_trial_size()));
     for (size_t i = 0; i < arraysize(kFieldTrialIds); ++i) {
@@ skipping 332 matching lines @@
               tracked_object->process_type());
   }
 }
 
 TEST_F(MetricsLogTest, ChromeChannelWrittenToProtobuf) {
   metrics::TestMetricsServiceClient client;
   TestMetricsLog log(
       "user@test.com", kSessionId, MetricsLog::ONGOING_LOG, &client, &prefs_);
   EXPECT_TRUE(log.uma_proto().system_profile().has_channel());
 }