Corrected assert for cacheable stylesheets.

third_party/WebKit/Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 475 matching lines @@
     m_dirtyTreeScopes.add(&scope);
 }
 
 void StyleEngine::markDocumentDirty()
 {
     m_documentScopeDirty = true;
     if (document().importLoader())
         document().importsController()->master()->styleEngine().markDocumentDirty();
 }
 
-static bool isCacheableForStyleElement(const StyleSheetContents& contents)
-{
-    // FIXME: Support copying import rules.
-    if (!contents.importRules().isEmpty())
-        return false;
-    // Until import rules are supported in cached sheets it's not possible for loading to fail.
-    DCHECK(!contents.didLoadErrorOccur());
-    // It is not the original sheet anymore.
-    if (contents.isMutable())
-        return false;
-    if (!contents.hasSyntacticallyValidCSSHeader())
-        return false;
-    return true;
-}
-
 CSSStyleSheet* StyleEngine::createSheet(Element* e, const String& text, TextPosition startPosition)
 {
     CSSStyleSheet* styleSheet = nullptr;
 
     e->document().styleEngine().addPendingSheet();
 
     AtomicString textContent(text);
 
     HeapHashMap<AtomicString, Member<StyleSheetContents>>::AddResult result = m_textToSheetCache.add(textContent, nullptr);
     if (result.isNewEntry || !result.storedValue->value) {
         styleSheet = StyleEngine::parseSheet(e, text, startPosition);
-        if (result.isNewEntry && isCacheableForStyleElement(*styleSheet->contents())) {
+        if (result.isNewEntry && styleSheet->contents()->isCacheableForStyleElement()) {
             result.storedValue->value = styleSheet->contents();
             m_sheetToTextCache.add(styleSheet->contents(), textContent);
         }
     } else {
         StyleSheetContents* contents = result.storedValue->value;
         DCHECK(contents);
-        DCHECK(isCacheableForStyleElement(*contents));
+        DCHECK(contents->isCacheableForStyleElement());
         DCHECK_EQ(contents->singleOwnerDocument(), e->document());
         styleSheet = CSSStyleSheet::createInline(contents, e, startPosition);
     }
 
     DCHECK(styleSheet);
     styleSheet->setTitle(e->title());
     return styleSheet;
 }
 
 CSSStyleSheet* StyleEngine::parseSheet(Element* e, const String& text, TextPosition startPosition)
@@ skipping 219 matching lines @@
     visitor->trace(m_styleInvalidator);
     visitor->trace(m_dirtyTreeScopes);
     visitor->trace(m_activeTreeScopes);
     visitor->trace(m_fontSelector);
     visitor->trace(m_textToSheetCache);
     visitor->trace(m_sheetToTextCache);
     CSSFontSelectorClient::trace(visitor);
 }
 
 } // namespace blink