Use sheetText() instead of decodedText() in the CSS preload scanner

third_party/WebKit/Source/core/fetch/CSSStyleSheetResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 69 matching lines @@
   StyleSheetResource::trace(visitor);
 }
 
 void CSSStyleSheetResource::didAddClient(ResourceClient* c) {
   DCHECK(StyleSheetResourceClient::isExpectedType(c));
   // Resource::didAddClient() must be before setCSSStyleSheet(), because
   // setCSSStyleSheet() may cause scripts to be executed, which could destroy
   // 'c' if it is an instance of HTMLLinkElement. see the comment of
   // HTMLLinkElement::setCSSStyleSheet.
   Resource::didAddClient(c);
-  if (m_didNotifyFirstData)
+
+  if (hasClient(c) && m_didNotifyFirstData)
     static_cast<StyleSheetResourceClient*>(c)->didAppendFirstData(this);
 
   // |c| might be removed in didAppendFirstData, so ensure it is still a client.
   if (hasClient(c) && !isLoading())
     static_cast<StyleSheetResourceClient*>(c)->setCSSStyleSheet(
         resourceRequest().url(), response().url(), encoding(), this);
 }
 
 const String CSSStyleSheetResource::sheetText(
     MIMETypeCheck mimeTypeCheck) const {
@@ skipping 91 matching lines @@
     // This stylesheet resource did conflict with another resource and was not
     // added to the cache.
     setParsedStyleSheetCache(nullptr);
     return;
   }
   setParsedStyleSheetCache(sheet);
   setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
 }
 
 }  // namespace blink