Add CHECK in PingLoaderImpl's destructor

third_party/WebKit/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 263 matching lines @@
                                            AllowStoredCredentials);
   m_loader->loadAsynchronously(wrappedRequest, this);
 
   // 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, BLINK_FROM_HERE);
 }
 
 PingLoaderImpl::~PingLoaderImpl() {
-  if (m_loader)
-    m_loader->cancel();
+  // TODO(kinuko): Turn this to DCHECK once crbug.com/662769 is resolved.
+  CHECK(!m_loader);
 }
 
 void PingLoaderImpl::dispose() {
   if (m_loader) {
     m_loader->cancel();
     m_loader = nullptr;
   }
   m_timeout.stop();
   m_keepAlive.clear();
 }
@@ skipping 284 matching lines @@
 bool PingLoader::sendBeacon(LocalFrame* frame,
                             int allowance,
                             const KURL& beaconURL,
                             Blob* data,
                             size_t& beaconSize) {
   BeaconBlob beacon(data);
   return sendBeaconCommon(frame, allowance, beaconURL, beacon, beaconSize);
 }
 
 }  // namespace blink