Return reference from styleEngine() accessor.

Source/core/css/FontFace.cpp

Index: Source/core/css/FontFace.cpp
diff --git a/Source/core/css/FontFace.cpp b/Source/core/css/FontFace.cpp
index 189f575067e47888909d633584f3f619614959b7..312156a7af990f6bc3ca86f42ece96f4b107c8f6 100644
--- a/Source/core/css/FontFace.cpp
+++ b/Source/core/css/FontFace.cpp
@@ -393,7 +393,7 @@ void FontFace::loadInternal(ExecutionContext* context)
         return;
 
     m_cssFontFace->load();
-    toDocument(context)->styleEngine()->fontSelector()->fontLoader()->loadPendingFonts();
+    toDocument(context)->styleEngine().fontSelector()->fontLoader()->loadPendingFonts();
 }
 
 FontTraits FontFace::traits() const
@@ -532,7 +532,7 @@ void FontFace::initCSSFontFace(Document* document, PassRefPtrWillBeRawPtr<CSSVal
             if (allowDownloading && item->isSupportedFormat() && document) {
                 FontResource* fetched = item->fetch(document);
                 if (fetched) {
-                    FontLoader* fontLoader = document->styleEngine()->fontSelector()->fontLoader();
+                    FontLoader* fontLoader = document->styleEngine().fontSelector()->fontLoader();
                     source = adoptPtrWillBeNoop(new RemoteFontFaceSource(fetched, fontLoader));
                 }
             }