Removing Nope button in Update password prompt according to mocks.

chrome/browser/password_manager/update_password_infobar_delegate_android.cc

 // 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.
 
 #include "chrome/browser/password_manager/update_password_infobar_delegate_android.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/numerics/safe_conversions.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
@@ skipping 64 matching lines @@
   passwords_state_.set_client(
       ChromePasswordManagerClient::FromWebContents(web_contents));
   passwords_state_.OnUpdatePassword(std::move(form_to_update));
 }
 
 infobars::InfoBarDelegate::InfoBarIdentifier
 UpdatePasswordInfoBarDelegate::GetIdentifier() const {
   return UPDATE_PASSWORD_INFOBAR_DELEGATE;
 }
 
+int UpdatePasswordInfoBarDelegate::GetButtons() const {
+  return BUTTON_OK;
+}
+
 base::string16 UpdatePasswordInfoBarDelegate::GetButtonLabel(
     InfoBarButton button) const {
-  return l10n_util::GetStringUTF16((button == BUTTON_OK)
-                                       ? IDS_PASSWORD_MANAGER_UPDATE_BUTTON
-                                       : IDS_PASSWORD_MANAGER_CANCEL_BUTTON);
+  return l10n_util::GetStringUTF16(IDS_PASSWORD_MANAGER_UPDATE_BUTTON);
 }
 
 bool UpdatePasswordInfoBarDelegate::Accept() {
   UpdatePasswordInfoBar* update_password_infobar =
       static_cast<UpdatePasswordInfoBar*>(infobar());
   password_manager::PasswordFormManager* form_manager =
       passwords_state_.form_manager();
   if (ShowMultipleAccounts()) {
     int form_index = update_password_infobar->GetIdOfSelectedUsername();
     DCHECK_GE(form_index, 0);
     DCHECK_LT(static_cast<size_t>(form_index), GetCurrentForms().size());
     form_manager->Update(*GetCurrentForms()[form_index]);
   } else {
     form_manager->Update(form_manager->pending_credentials());
   }
   return true;
 }
 
 bool UpdatePasswordInfoBarDelegate::Cancel() {

[gone, 2016/09/01 18:16:51]

nit: You can get rid of this function; the default seems to handle it just fine.

[dvadym, 2016/09/02 11:53:39]

Done.

   return true;
 }