Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/loader/WorkerThreadableLoader.cpp

 /*
  * Copyright (C) 2009, 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 138 matching lines @@
 }
 
 void WorkerThreadableLoader::MainThreadBridge::mainThreadCancel(ExecutionContext* context, MainThreadBridge* thisPtr)
 {
     ASSERT(isMainThread());
     ASSERT_UNUSED(context, context->isDocument());
 
     if (!thisPtr->m_mainThreadLoader)
         return;
     thisPtr->m_mainThreadLoader->cancel();
-    thisPtr->m_mainThreadLoader = 0;
+    thisPtr->m_mainThreadLoader = nullptr;
 }
 
 void WorkerThreadableLoader::MainThreadBridge::cancel()
 {
     m_loaderProxy.postTaskToLoader(
         createCallbackTask(&MainThreadBridge::mainThreadCancel, AllowCrossThreadAccess(this)));
     ThreadableLoaderClientWrapper* clientWrapper = m_workerClientWrapper.get();
     if (!clientWrapper->done()) {
         // If the client hasn't reached a termination state, then transition it by sending a cancellation error.
         // Note: no more client callbacks will be done after this method -- the clearClientWrapper() call ensures that.
@@ skipping 48 matching lines @@
 {
     m_clientBridge->didFailAccessControlCheck(error);
 }
 
 void WorkerThreadableLoader::MainThreadBridge::didFailRedirectCheck()
 {
     m_clientBridge->didFailRedirectCheck();
 }
 
 } // namespace WebCore