Pass implementation object to supplemental classes by reference

Source/core/css/CSSFontFace.cpp

Index: Source/core/css/CSSFontFace.cpp
diff --git a/Source/core/css/CSSFontFace.cpp b/Source/core/css/CSSFontFace.cpp
index bfb995e50ed1211448bb7f4a455aaa6fa43822c4..6374b8c501ab500502d0f64a06b7c798f5af0b9b 100644
--- a/Source/core/css/CSSFontFace.cpp
+++ b/Source/core/css/CSSFontFace.cpp
@@ -161,13 +161,13 @@ void CSSFontFace::setLoadStatus(FontFace::LoadStatus newStatus)
 
     switch (newStatus) {
     case FontFace::Loading:
-        FontFaceSet::from(document)->beginFontLoading(m_fontFace);
+        FontFaceSet::from(*document)->beginFontLoading(m_fontFace);
         break;
     case FontFace::Loaded:
-        FontFaceSet::from(document)->fontLoaded(m_fontFace);
+        FontFaceSet::from(*document)->fontLoaded(m_fontFace);
         break;
     case FontFace::Error:
-        FontFaceSet::from(document)->loadError(m_fontFace);
+        FontFaceSet::from(*document)->loadError(m_fontFace);
         break;
     default:
         break;