[aura] Fix LoginUserTest.UserPassed on Aura.

ScreenLocker is excluded from Aura build till it is fixed.

BUG=103489
TEST=LoginUserTest.UserPassed

Review URL: http://codereview.chromium.org/8568045

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110901 0039d316-1c4b-4281-b951-d872f2087c98

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) {