Ensure RemoteFontFaceSource doesn't try to start a load in a detached document

third_party/WebKit/Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 235 matching lines @@
 }
 
 DEFINE_TRACE(Resource)
 {
     visitor->trace(m_loader);
     visitor->trace(m_cacheHandler);
 }
 
 void Resource::load(ResourceFetcher* fetcher)
 {
+    // TOOD(japhet): Temporary, out of place hack to stop a top crasher.
+    // Make this more organic.
+    if (!fetcher->loadingTaskRunner())
+        return;
+
     RELEASE_ASSERT(!m_loader);
     ASSERT(stillNeedsLoad());
     m_status = Pending;
 
     ResourceRequest& request(m_revalidatingRequest.isNull() ? m_resourceRequest : m_revalidatingRequest);
     KURL url = request.url();
     request.setAllowStoredCredentials(m_options.allowCredentials == AllowStoredCredentials);
 
     m_loader = ResourceLoader::create(fetcher, this);
     m_loader->start(request);
@@ skipping 804 matching lines @@
     case Resource::Media:
         return "Media";
     case Resource::Manifest:
         return "Manifest";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 
 } // namespace blink