Allow explicit conversion operators and implement WTF::OwnPtr::operator bool.

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 930 matching lines @@
 void XMLHttpRequest::abort()
 {
     WTF_LOG(Network, "XMLHttpRequest %p abort()", this);
 
     // internalAbort() clears |m_loader|. Compute |sendFlag| now.
     //
     // |sendFlag| corresponds to "the send() flag" defined in the XHR spec.
     //
     // |sendFlag| is only set when we have an active, asynchronous loader.
     // Don't use it as "the send() flag" when the XHR is in sync mode.
-    bool sendFlag = m_loader;
+    bool sendFlag = !!m_loader;
 
     // internalAbort() clears the response. Save the data needed for
     // dispatching ProgressEvents.
     long long expectedLength = m_response.expectedContentLength();
     long long receivedLength = m_receivedLength;
 
     if (!internalAbort())
         return;
 
     // The script never gets any chance to call abort() on a sync XHR between
@@ skipping 56 matching lines @@
     //
     // If, window.onload contains open() and send(), m_loader will be set to
     // non 0 value. So, we cannot continue the outer open(). In such case,
     // just abort the outer open() by returning false.
     OwnPtr<ThreadableLoader> loader = m_loader.release();
     loader->cancel();
 
     // If abort() called internalAbort() and a nested open() ended up
     // clearing the error flag, but didn't send(), make sure the error
     // flag is still set.
-    bool newLoadStarted = m_loader;
+    bool newLoadStarted = !!m_loader;
     if (!newLoadStarted)
         m_error = true;
 
     return !newLoadStarted;
 }
 
 void XMLHttpRequest::clearResponse()
 {
     // FIXME: when we add the support for multi-part XHR, we will have to
     // be careful with this initialization.
@@ skipping 665 matching lines @@
     visitor->trace(m_responseArrayBuffer);
     visitor->trace(m_progressEventThrottle);
     visitor->trace(m_upload);
     visitor->trace(m_blobLoader);
     XMLHttpRequestEventTarget::trace(visitor);
     DocumentParserClient::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink