[Password Manager] Modified to support saving passwords on forms without username fields.

components/password_manager/core/browser/password_form_manager.cc

 // Copyright (c) 2012 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.
 
 #include "components/password_manager/core/browser/password_form_manager.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/metrics/histogram.h"
@@ skipping 209 matching lines @@
   // has already given consent, so we treat these cases the same.
   return has_generated_password_;
 }
 
 bool PasswordFormManager::HasValidPasswordForm() {
   DCHECK_EQ(state_, POST_MATCHING_PHASE);
   // Non-HTML password forms (primarily HTTP and FTP autentication)
   // do not contain username_element and password_element values.
   if (observed_form_.scheme != PasswordForm::SCHEME_HTML)
     return true;
-  return !observed_form_.username_element.empty() &&
-         (!observed_form_.password_element.empty() ||
-          !observed_form_.new_password_element.empty());
+  return !observed_form_.password_element.empty() ||
+         !observed_form_.new_password_element.empty();
 }
 
 void PasswordFormManager::ProvisionallySave(
     const PasswordForm& credentials,
     OtherPossibleUsernamesAction action) {
   DCHECK_EQ(state_, POST_MATCHING_PHASE);
   DCHECK_NE(RESULT_NO_MATCH, DoesManage(credentials));
 
   // If this was a sign-up or change password form, we want to persist the new
   // password; if this was a login form, then the current password (which might
@@ skipping 553 matching lines @@
     LogPasswordGenerationSubmissionEvent(PASSWORD_SUBMITTED);
 }
 
 void PasswordFormManager::SubmitFailed() {
   submit_result_ = kSubmitResultFailed;
   if (has_generated_password_)
     LogPasswordGenerationSubmissionEvent(PASSWORD_SUBMISSION_FAILED);
 }
 
 }  // namespace password_manager