Rename ArcCustomNotificationView to ArcNotificationContentView

ui/arc/notification/arc_notification_delegate.cc

Index: ui/arc/notification/arc_notification_delegate.cc
diff --git a/ui/arc/notification/arc_notification_delegate.cc b/ui/arc/notification/arc_notification_delegate.cc
index 488eb99d86fb92b3033abe29e1fc854c6a70fa8b..8035e6110731ff5c1769c8f5b031eb3367234493 100644
--- a/ui/arc/notification/arc_notification_delegate.cc
+++ b/ui/arc/notification/arc_notification_delegate.cc
@@ -4,7 +4,7 @@
 
 #include "ui/arc/notification/arc_notification_delegate.h"
 
-#include "ui/arc/notification/arc_custom_notification_view.h"
+#include "ui/arc/notification/arc_notification_content_view.h"
 #include "ui/arc/notification/arc_notification_item.h"
 #include "ui/arc/notification/arc_notification_view.h"
 #include "ui/message_center/notification.h"
@@ -28,7 +28,7 @@ ArcNotificationDelegate::CreateCustomMessageView(
   DCHECK(item_);
   DCHECK_EQ(item_->GetNotificationId(), notification.id());
 
-  auto view = base::MakeUnique<ArcCustomNotificationView>(item_.get());
+  auto view = base::MakeUnique<ArcNotificationContentView>(item_.get());
   auto content_view_delegate = view->CreateContentViewDelegate();
   return base::MakeUnique<ArcNotificationView>(std::move(view),
                                                std::move(content_view_delegate),