Oilpan: move DateTimeChooser to the heap.

third_party/WebKit/Source/core/loader/EmptyClients.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 80 matching lines @@
 PassRefPtrWillBeRawPtr<PopupMenu> EmptyChromeClient::openPopupMenu(LocalFrame&, HTMLSelectElement&)
 {
     return adoptRefWillBeNoop(new EmptyPopupMenu());
 }
 
 PassOwnPtrWillBeRawPtr<ColorChooser> EmptyChromeClient::openColorChooser(LocalFrame*, ColorChooserClient*, const Color&)
 {
     return nullptr;
 }
 
-PassRefPtr<DateTimeChooser> EmptyChromeClient::openDateTimeChooser(DateTimeChooserClient*, const DateTimeChooserParameters&)
+PassRefPtrWillBeRawPtr<DateTimeChooser> EmptyChromeClient::openDateTimeChooser(DateTimeChooserClient*, const DateTimeChooserParameters&)
 {
-    return PassRefPtr<DateTimeChooser>();
+    return nullptr;
 }
 
 void EmptyChromeClient::openTextDataListChooser(HTMLInputElement&)
 {
 }
 
 void EmptyChromeClient::openFileChooser(LocalFrame*, PassRefPtr<FileChooser>)
 {
 }
 
@@ skipping 67 matching lines @@
 {
     return nullptr;
 }
 
 PassOwnPtr<WebApplicationCacheHost> EmptyFrameLoaderClient::createApplicationCacheHost(WebApplicationCacheHostClient*)
 {
     return nullptr;
 }
 
 } // namespace blink