Move rendering/RenderObject to layout/LayoutObject.

Source/core/dom/FirstLetterPseudoElement.h

Index: Source/core/dom/FirstLetterPseudoElement.h
diff --git a/Source/core/dom/FirstLetterPseudoElement.h b/Source/core/dom/FirstLetterPseudoElement.h
index 407bf31e388e6e8ca0b27a1c9112983896b320c9..8f6d3b904e3fade6ee2dfef1cd1c1c9bd3ed2544 100644
--- a/Source/core/dom/FirstLetterPseudoElement.h
+++ b/Source/core/dom/FirstLetterPseudoElement.h
@@ -31,7 +31,7 @@
 namespace blink {
 
 class Element;
-class RenderObject;
+class LayoutObject;
 class RenderTextFragment;
 
 class FirstLetterPseudoElement final : public PseudoElement {
@@ -44,7 +44,7 @@ public:
 
     virtual ~FirstLetterPseudoElement();
 
-    static RenderObject* firstLetterTextRenderer(const Element&);
+    static LayoutObject* firstLetterTextRenderer(const Element&);
     static unsigned firstLetterLength(const String&);
 
     void setRemainingTextRenderer(RenderTextFragment*);
@@ -61,7 +61,7 @@ private:
     virtual void didRecalcStyle(StyleRecalcChange) override;
 
     void attachFirstLetterTextRenderers();
-    RenderStyle* styleForFirstLetter(RenderObject*);
+    RenderStyle* styleForFirstLetter(LayoutObject*);
 
     RenderTextFragment* m_remainingTextRenderer;
 };