Improve DEFINE_STATIC_LOCAL()'s handling of Blink GCed objects.

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 27 matching lines @@
 #include "public/platform/WebApplicationCacheHost.h"
 #include "public/platform/WebMediaPlayer.h"
 #include "public/platform/modules/mediasession/WebMediaSession.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerProvider.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerProviderClient.h"
 
 namespace blink {
 
 void fillWithEmptyClients(Page::PageClients& pageClients)
 {
-    DEFINE_STATIC_LOCAL(Persistent<ChromeClient>, dummyChromeClient, (EmptyChromeClient::create()));
-    pageClients.chromeClient = dummyChromeClient.get();
+    DEFINE_STATIC_LOCAL(ChromeClient, dummyChromeClient, (EmptyChromeClient::create()));
+    pageClients.chromeClient = &dummyChromeClient;
 
     DEFINE_STATIC_LOCAL(EmptyContextMenuClient, dummyContextMenuClient, ());
     pageClients.contextMenuClient = &dummyContextMenuClient;
 
     DEFINE_STATIC_LOCAL(EmptyDragClient, dummyDragClient, ());
     pageClients.dragClient = &dummyDragClient;
 
     DEFINE_STATIC_LOCAL(EmptyEditorClient, dummyEditorClient, ());
     pageClients.editorClient = &dummyEditorClient;
 
@@ skipping 119 matching lines @@
 {
     return nullptr;
 }
 
 PassOwnPtr<WebApplicationCacheHost> EmptyFrameLoaderClient::createApplicationCacheHost(WebApplicationCacheHostClient*)
 {
     return nullptr;
 }
 
 } // namespace blink