Delete NetworkingContext and its subclasses.

Source/core/loader/PingLoader.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 107 matching lines @@
 
     // Leak the ping loader, since it will kill itself as soon as it receives a response.
     PingLoader* leakedPingLoader = pingLoader.leakPtr();
     UNUSED_PARAM(leakedPingLoader);
 }
 
 PingLoader::PingLoader(Frame* frame, ResourceRequest& request, StoredCredentials credentialsAllowed)
     : m_timeout(this, &PingLoader::timeout)
 {
     unsigned long identifier = createUniqueIdentifier();
-    m_handle = ResourceHandle::create(frame->loader()->networkingContext(), request, this, false, false, credentialsAllowed);
+    m_handle = ResourceHandle::create(request, this, false, false, credentialsAllowed);
 
     InspectorInstrumentation::continueAfterPingLoader(frame, identifier, frame->loader()->activeDocumentLoader(), request, ResourceResponse());
 
     // If the server never responds, FrameLoader won't be able to cancel this load and
     // we'll sit here waiting forever. Set a very generous timeout, just in case.
     m_timeout.startOneShot(60000);
 }
 
 PingLoader::~PingLoader()
 {
     if (m_handle)
         m_handle->cancel();
 }
 
 }