MD Settings: Allow empty passwords when importing certificate.

chrome/test/data/webui/settings/certificate_manager_page_test.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('certificate_manager_page', function() {
   /**
    * A test version of CertificatesBrowserProxy. Provides helper methods
    * for allowing tests to know when a method was called, as well as
    * specifying mock responses.
    *
@@ skipping 422 matching lines @@
             'settings-certificate-password-decryption-dialog');
         document.body.appendChild(dialog);
       });
 
       teardown(function() { dialog.remove(); });
 
       test('DecryptSuccess', function() {
         var passwordInputElement =
             Polymer.dom(dialog.$.dialog).querySelector('paper-input');
         assertTrue(dialog.$.dialog.open);
-        assertTrue(dialog.$.ok.disabled);
 
-        // Test that the 'OK' button is disabled when the password field is
+        // Test that the 'OK' button is enabled even when the password field is
         // empty.
-        triggerInputEvent(passwordInputElement);
-        assertTrue(dialog.$.ok.disabled);
+        assertEquals('', passwordInputElement.value);
+        assertFalse(dialog.$.ok.disabled);
+
         passwordInputElement.value = 'foopassword';
-        triggerInputEvent(passwordInputElement);
         assertFalse(dialog.$.ok.disabled);
 
         // Simulate clicking 'OK'.
         MockInteractions.tap(dialog.$.ok);
 
         return browserProxy.whenCalled(methodName).then(function(password) {
           assertEquals(passwordInputElement.value, password);
           // Check that the dialog is closed.
           assertFalse(dialog.$.dialog.open);
         });
@@ skipping 400 matching lines @@
       registerCaTrustEditDialogTests();
       registerDeleteDialogTests();
       registerPasswordEncryptDialogTests();
       registerPasswordDecryptDialogTests();
       registerPageTests();
       registerCertificateSubentryTests();
       registerCertificateListTests();
     },
   };
 });