Remove many delegates, let's see what breaks

chrome/browser/notifications/persistent_notification_delegate.cc

-// Copyright 2014 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/notifications/persistent_notification_delegate.h"
-
-#include "base/strings/nullable_string16.h"
-#include "chrome/browser/notifications/platform_notification_service_impl.h"
-#include "url/gurl.h"
-
-PersistentNotificationDelegate::PersistentNotificationDelegate(
-    content::BrowserContext* browser_context,
-    const std::string& notification_id,
-    const GURL& origin,
-    int notification_settings_index)
-    : WebNotificationDelegate(browser_context, notification_id, origin),
-      notification_settings_index_(notification_settings_index) {}
-
-PersistentNotificationDelegate::~PersistentNotificationDelegate() {}
-
-void PersistentNotificationDelegate::Display() {}
-
-void PersistentNotificationDelegate::Close(bool by_user) {
-  PlatformNotificationServiceImpl::GetInstance()->OnPersistentNotificationClose(
-      browser_context(), id(), origin(), by_user);
-}
-
-void PersistentNotificationDelegate::Click() {
-  PlatformNotificationServiceImpl::GetInstance()->OnPersistentNotificationClick(
-      browser_context(), id(), origin(), -1 /* action_index */,
-      base::NullableString16() /* reply */);
-}
-
-void PersistentNotificationDelegate::ButtonClick(int button_index) {
-  DCHECK_GE(button_index, 0);
-  if (button_index == notification_settings_index_) {
-    NotificationCommon::OpenNotificationSettings(browser_context());
-    return;
-  }
-
-  PlatformNotificationServiceImpl::GetInstance()->OnPersistentNotificationClick(
-      browser_context(), id(), origin(), button_index,
-      base::NullableString16() /* reply */);
-}
-
-void PersistentNotificationDelegate::ButtonClickWithReply(
-    int button_index,
-    const base::string16& reply) {
-  DCHECK_GE(button_index, 0);
-  DCHECK_NE(button_index, notification_settings_index_);
-  PlatformNotificationServiceImpl::GetInstance()->OnPersistentNotificationClick(
-      browser_context(), id(), origin(), button_index,
-      base::NullableString16(reply, false /* is_null */));
-}