[arc notifications] Inspect pinned flag directly for IsPinned().

ui/arc/notification/arc_custom_notification_view.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 "ui/arc/notification/arc_custom_notification_view.h"
 
 #include "ash/wm/window_util.h"
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "components/exo/notification_surface.h"
@@ skipping 151 matching lines @@
     return owner_->floating_close_button_->HasFocus();
   }
 
   void RequestFocusOnCloseButton() override {
     if (owner_->floating_close_button_)
       owner_->floating_close_button_->RequestFocus();
     owner_->UpdateCloseButtonVisiblity();
   }
 
   bool IsPinned() const override {
-    return owner_->floating_close_button_ == nullptr;
+    return owner_->item_->pinned();
   }
 
  private:
   ArcCustomNotificationView* const owner_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewDelegate);
 };
 
 class ArcCustomNotificationView::CloseButton : public views::ImageButton {
  public:
@@ skipping 364 matching lines @@
 
 void ArcCustomNotificationView::OnNotificationSurfaceRemoved(
     exo::NotificationSurface* surface) {
   if (surface->notification_id() != notification_key_)
     return;
 
   SetSurface(nullptr);
 }
 
 }  // namespace arc