Retrieve pinned flag directly from Notification class

ui/message_center/views/message_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/message_view.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/simple_menu_model.h"
@@ skipping 66 matching lines @@
       kFocusBorderColor, gfx::Insets(0, 1, 3, 2));
 
   UpdateWithNotification(notification);
 }
 
 MessageView::~MessageView() {
 }
 
 void MessageView::UpdateWithNotification(const Notification& notification) {
   display_source_ = notification.display_source();
+  pinned_ = notification.pinned();
   accessible_name_ = CreateAccessibleName(notification);
   set_slide_out_enabled(!notification.pinned());
 }
 
 // static
 gfx::Insets MessageView::GetShadowInsets() {
   return -gfx::ShadowValue::GetMargin(
       gfx::ShadowDetails::Get(kShadowElevation, kShadowCornerRadius).values);
 }
 
@@ skipping 124 matching lines @@
 }
 
 void MessageView::SetDrawBackgroundAsActive(bool active) {
   background_view_->background()->
       SetNativeControlColor(active ? kHoveredButtonBackgroundColor :
                                      kNotificationBackgroundColor);
   SchedulePaint();
 }
 
 }  // namespace message_center