Remove StyleEngine.h include from RenderObject.h

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index b276c47391ce6887944ec862fe0b0c77966a2335..5761e3e8ccb477117a02c461304c41a25808ec25 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -26,10 +26,10 @@
 #ifndef RenderObject_h
 #define RenderObject_h
 
+#include "core/dom/Document.h"
 #include "core/dom/DocumentLifecycle.h"
 #include "core/dom/Element.h"
 #include "core/dom/Position.h"
-#include "core/dom/StyleEngine.h"
 #include "core/fetch/ImageResourceClient.h"
 #include "core/rendering/HitTestRequest.h"
 #include "core/rendering/PaintPhase.h"
@@ -765,8 +765,8 @@ public:
     virtual LayoutUnit maxPreferredLogicalWidth() const { return 0; }
 
     RenderStyle* style() const { return m_style.get(); }
-    RenderStyle* firstLineStyle() const { return document().styleEngine()->usesFirstLineRules() ? cachedFirstLineStyle() : style(); }
-    RenderStyle* styleOrFirstLineStyle(bool firstLine) const { return firstLine ? firstLineStyle() : style(); }
+    RenderStyle* firstLineStyle() const;
+    RenderStyle* styleOrFirstLineStyle(bool firstLine) const;
 
     inline Color resolveColor(const RenderStyle* styleToUse, int colorProperty) const
     {