metrics: Shutdown LoginState after CrOSMetricsProvider tests

chrome/browser/metrics/chromeos_metrics_provider_unittest.cc

 // Copyright 2014 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/chromeos_metrics_provider.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "chrome/browser/chromeos/login/users/fake_user_manager.h"
@@ skipping 63 matching lines @@
     fake_bluetooth_adapter_client_ = static_cast<FakeBluetoothAdapterClient*>(
         DBusThreadManager::Get()->GetBluetoothAdapterClient());
     fake_bluetooth_device_client_ = static_cast<FakeBluetoothDeviceClient*>(
         DBusThreadManager::Get()->GetBluetoothDeviceClient());
 
     // Initialize the login state trackers.
     if (!chromeos::LoginState::IsInitialized())
       chromeos::LoginState::Initialize();
   }
 
-  virtual void TearDown() OVERRIDE { DBusThreadManager::Shutdown(); }
+  virtual void TearDown() OVERRIDE {
+    // Destroy the login state tracker if it was initialized.
+    chromeos::LoginState::Shutdown();
+
+    DBusThreadManager::Shutdown();
+  }
 
  protected:
   FakeBluetoothAdapterClient* fake_bluetooth_adapter_client_;
   FakeBluetoothDeviceClient* fake_bluetooth_device_client_;
 
  private:
   content::TestBrowserThreadBundle thread_bundle_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeOSMetricsProviderTest);
 };
@@ skipping 124 matching lines @@
   // Second device should match the Confirm Passkey object, this has
   // no Device ID information.
   PairedDevice device2 = system_profile.hardware().bluetooth().paired_device(1);
 
   EXPECT_EQ(FakeBluetoothDeviceClient::kConfirmPasskeyClass,
             device2.bluetooth_class());
   EXPECT_EQ(PairedDevice::DEVICE_PHONE, device2.type());
   EXPECT_EQ(0x207D74U, device2.vendor_prefix());
   EXPECT_EQ(PairedDevice::VENDOR_ID_UNKNOWN, device2.vendor_id_source());
 }