Bug 1275311 - Get property when in content in security notification UI test; r=whimboo

MozReview-Commit-ID: 1mIed8b8uXY

--HG--
extra : rebase_source : e21b4565c5b146faa4468d4569dabe34e182ae8f

testing/firefox-ui/tests/functional/security/test_security_notification.py

@@ -36,14 +36,14 @@ class TestSecurityNotification(FirefoxTestCase):
 
             # Verify the text in Technical Content contains the page with invalid cert
             text = self.marionette.find_element(By.ID, 'badCertTechnicalInfo')
-            self.assertIn(self.urls[0][8:], text.get_attribute('textContent'))
+            self.assertIn(self.urls[0][8:], text.get_property('textContent'))
 
             # Verify the "Go Back" and "Advanced" buttons appear
             self.assertIsNotNone(self.marionette.find_element(By.ID, 'returnButton'))
             self.assertIsNotNone(self.marionette.find_element(By.ID, 'advancedButton'))
 
             # Verify the error code is correct
-            self.assertIn('SEC_ERROR_EXPIRED_CERTIFICATE', text.get_attribute('textContent'))
+            self.assertIn('SEC_ERROR_EXPIRED_CERTIFICATE', text.get_property('textContent'))
 
     def test_secure_website(self):
         with self.marionette.using_context('content'):