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

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

Index: third_party/WebKit/Source/core/dom/StyleEngine.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.cpp b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
index 3d72eb0d5f58abd4fa4a25164c8fca92fbca39bf..6a5d1cee16dcd80a5e82f980cc0b12abbbd8b548 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
@@ -461,13 +461,13 @@
   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();
 }
@@ -491,7 +491,7 @@
   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)