Revert of Move the FontFaceCache stored in CSSFontSelector to be stored in Document.

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.
@@ skipping 443 matching lines @@
 
 void StyleEngine::didDetach() {
   clearResolvers();
   m_globalRuleSet.dispose();
   m_treeBoundaryCrossingScopes.clear();
   m_dirtyTreeScopes.clear();
   m_activeTreeScopes.clear();
   m_viewportResolver = nullptr;
   m_mediaQueryEvaluator = nullptr;
   if (m_fontSelector)
-    m_document->fontFaceCache()->clearAll();
+    m_fontSelector->fontFaceCache()->clearAll();
   m_fontSelector = nullptr;
 }
 
 void StyleEngine::clearFontCache() {
   if (m_fontSelector)
-    m_document->fontFaceCache()->clearCSSConnected();
+    m_fontSelector->fontFaceCache()->clearCSSConnected();
   if (m_resolver)
     m_resolver->invalidateMatchedPropertiesCache();
 }
 
 void StyleEngine::updateGenericFontFamilySettings() {
   // FIXME: we should not update generic font family settings when
   // document is inactive.
   DCHECK(document().isActive());
 
   if (!m_fontSelector)
     return;
 
   m_fontSelector->updateGenericFontFamilySettings(*m_document);
   if (m_resolver)
     m_resolver->invalidateMatchedPropertiesCache();
   FontCache::fontCache()->invalidateShapeCache();
 }
 
 void StyleEngine::removeFontFaceRules(
     const HeapVector<Member<const StyleRuleFontFace>>& fontFaceRules) {
   if (!m_fontSelector)
     return;
 
-  FontFaceCache* cache = m_document->fontFaceCache();
+  FontFaceCache* cache = m_fontSelector->fontFaceCache();
   for (const auto& rule : fontFaceRules)
     cache->remove(rule);
   if (m_resolver)
     m_resolver->invalidateMatchedPropertiesCache();
 }
 
 void StyleEngine::markTreeScopeDirty(TreeScope& scope) {
   if (scope == m_document) {
     markDocumentDirty();
     return;
@@ skipping 641 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink