Fix null dereference on MemoryCache.

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 27 matching lines @@
 
 namespace blink {
 
 ResourcePtr<CSSStyleSheetResource> CSSStyleSheetResource::fetch(FetchRequest& request, ResourceFetcher* fetcher)
 {
     ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
     request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextStyle);
     return toCSSStyleSheetResource(fetcher->requestResource(request, CSSStyleSheetResourceFactory()));
 }
 
+ResourcePtr<CSSStyleSheetResource> CSSStyleSheetResource::createForTest(const ResourceRequest& request, const String& charset)
+{
+    return new CSSStyleSheetResource(request, charset);
+}
+
 CSSStyleSheetResource::CSSStyleSheetResource(const ResourceRequest& resourceRequest, const String& charset)
     : StyleSheetResource(resourceRequest, CSSStyleSheet, "text/css", charset)
 {
     DEFINE_STATIC_LOCAL(const AtomicString, acceptCSS, ("text/css,*/*;q=0.1", AtomicString::ConstructFromLiteral));
 
     // Prefer text/css but accept any type (dell.com serves a stylesheet
     // as text/html; see <http://bugs.webkit.org/show_bug.cgi?id=11451>).
     setAccept(acceptCSS);
 }
 
@@ skipping 121 matching lines @@
 
     if (m_parsedStyleSheetCache)
         m_parsedStyleSheetCache->removedFromMemoryCache();
     m_parsedStyleSheetCache = sheet;
     m_parsedStyleSheetCache->addedToMemoryCache();
 
     setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
 }
 
 }