metrics: Shutdown LoginState after CrOSMetricsProvider tests

chrome/browser/metrics/chromeos_metrics_provider_unittest.cc

Index: chrome/browser/metrics/chromeos_metrics_provider_unittest.cc
diff --git a/chrome/browser/metrics/chromeos_metrics_provider_unittest.cc b/chrome/browser/metrics/chromeos_metrics_provider_unittest.cc
index 1e32848b1729fa1983266738a1902d647f2cf705..19869754c56b53570491bcdc715469cb1b407384 100644
--- a/chrome/browser/metrics/chromeos_metrics_provider_unittest.cc
+++ b/chrome/browser/metrics/chromeos_metrics_provider_unittest.cc
@@ -81,7 +81,12 @@ class ChromeOSMetricsProviderTest : public testing::Test {
       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_;