HTML Imports: Fix yet another FOUC

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 7ded0203c9403dbf09b98107d843511280e6724e..5c412c674ed019f230ad475fbccdcba2dba638f4 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -603,7 +603,7 @@ PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderS
 
     // Once an element has a renderer, we don't try to destroy it, since otherwise the renderer
     // will vanish if a style recalc happens during loading.
-    if (sharingBehavior == AllowStyleSharing && !document().styleEngine()->haveStylesheetsLoaded() && !element->renderer()) {
+    if (sharingBehavior == AllowStyleSharing && !document().isRenderingReady() && !element->renderer()) {
         if (!s_styleNotYetAvailable) {
             s_styleNotYetAvailable = RenderStyle::create().leakRef();
             s_styleNotYetAvailable->setDisplay(NONE);