Do not spawn a thread in browser/interactive ui tests before spawning sandbox host process

chrome/browser/chromeos/login/screens/update_screen_browsertest.cc

Index: chrome/browser/chromeos/login/screens/update_screen_browsertest.cc
diff --git a/chrome/browser/chromeos/login/screens/update_screen_browsertest.cc b/chrome/browser/chromeos/login/screens/update_screen_browsertest.cc
index a56d55e7fd43fe2e55d088d43bf7c37f39f43f33..b3aefe70e95a4da9abd9bb88a5ed5d9472d9b4d7 100644
--- a/chrome/browser/chromeos/login/screens/update_screen_browsertest.cc
+++ b/chrome/browser/chromeos/login/screens/update_screen_browsertest.cc
@@ -49,7 +49,7 @@ class UpdateScreenTest : public WizardInProcessBrowserTest {
     fake_dbus_thread_manager->SetUpdateEngineClient(
         scoped_ptr<UpdateEngineClient>(fake_update_engine_client_));
 
-    DBusThreadManager::InitializeForTesting(fake_dbus_thread_manager);
+    DBusThreadManager::SetInstanceForTesting(fake_dbus_thread_manager);
     WizardInProcessBrowserTest::SetUpInProcessBrowserTestFixture();
 
     // Setup network portal detector to return online state for both
@@ -90,7 +90,6 @@ class UpdateScreenTest : public WizardInProcessBrowserTest {
   virtual void TearDownInProcessBrowserTestFixture() OVERRIDE {
     NetworkPortalDetector::Shutdown();
     WizardInProcessBrowserTest::TearDownInProcessBrowserTestFixture();
-    DBusThreadManager::Shutdown();
   }
 
   void SetDefaultNetworkPath(const std::string& service_path) {