Retrieve pinned flag directly from Notification class

ui/message_center/views/notification_view.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 "ui/message_center/views/notification_view.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 390 matching lines @@
   const views::FocusManager* focus_manager = GetFocusManager();
   return focus_manager &&
          focus_manager->GetFocusedView() == close_button_.get();
 }
 
 void NotificationView::RequestFocusOnCloseButton() {
   if (close_button_)
     close_button_->RequestFocus();
 }
 
-bool NotificationView::IsPinned() const {
-  return !close_button_;
-}
-
 void NotificationView::CreateOrUpdateTitleView(
     const Notification& notification) {
   if (notification.title().empty()) {
     // Deletion will also remove |title_view_| from its parent.
     delete title_view_;
     title_view_ = nullptr;
     return;
   }
 
   DCHECK(top_view_);
@@ skipping 334 matching lines @@
 
   return message_line_limit;
 }
 
 int NotificationView::GetMessageHeight(int width, int limit) const {
   return message_view_ ?
          message_view_->GetSizeForWidthAndLines(width, limit).height() : 0;
 }
 
 }  // namespace message_center