Reland: WTF: Implement explicit RefPtr::operator bool.

third_party/WebKit/Source/core/fetch/SubstituteData.h

 /*
  * Copyright (C) 2007 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 38 matching lines @@
 
     SubstituteData(PassRefPtr<SharedBuffer> content, const AtomicString& mimeType, const AtomicString& textEncoding, const KURL& failingURL, SubstituteDataLoadPolicy substituteDataLoadPolicy = LoadNormally)
         : m_content(content)
         , m_mimeType(mimeType)
         , m_textEncoding(textEncoding)
         , m_failingURL(failingURL)
         , m_substituteDataLoadPolicy(substituteDataLoadPolicy)
     {
     }
 
-    bool isValid() const { return m_content; }
+    bool isValid() const { return m_content.get(); }
 
     SharedBuffer* content() const { return m_content.get(); }
     const AtomicString& mimeType() const { return m_mimeType; }
     const AtomicString& textEncoding() const { return m_textEncoding; }
     const KURL& failingURL() const { return m_failingURL; }
     bool forceSynchronousLoad() const { return m_substituteDataLoadPolicy == ForceSynchronousLoad; }
 
 private:
     RefPtr<SharedBuffer> m_content;
     AtomicString m_mimeType;
     AtomicString m_textEncoding;
     KURL m_failingURL;
     SubstituteDataLoadPolicy m_substituteDataLoadPolicy;
 };
 
 } // namespace blink
 
 #endif // SubstituteData_h