[aura] Fix LoginUserTest.UserPassed on Aura.

chrome/browser/chromeos/login/login_browsertest.cc

Index: chrome/browser/chromeos/login/login_browsertest.cc
diff --git a/chrome/browser/chromeos/login/login_browsertest.cc b/chrome/browser/chromeos/login/login_browsertest.cc
index e50a69cbaae768cda60b05b358041b1c03b2ade2..0f87183c38e478f7144ef55559aabc714dda047a 100644
--- a/chrome/browser/chromeos/login/login_browsertest.cc
+++ b/chrome/browser/chromeos/login/login_browsertest.cc
@@ -51,8 +51,11 @@ class LoginUserTest : public LoginTestBase {
  protected:
   virtual void SetUpInProcessBrowserTestFixture() {
     LoginTestBase::SetUpInProcessBrowserTestFixture();
+    // TODO(nkostylev): Remove this once Aura build includes ScreenLocker.
+#if !defined(USE_AURA)
     EXPECT_CALL(*mock_screen_lock_library_, AddObserver(_))
         .WillOnce(Return());
+#endif
   }
 
   virtual void SetUpCommandLine(CommandLine* command_line) {