Rename renderer to layoutObject in core/editing.

Source/core/editing/FrameSelection.h

Index: Source/core/editing/FrameSelection.h
diff --git a/Source/core/editing/FrameSelection.h b/Source/core/editing/FrameSelection.h
index 492861a9f023d44615f123918503d0d2e99624ff..d1fefa149bf76ccaeb597c561c2d91590875649c 100644
--- a/Source/core/editing/FrameSelection.h
+++ b/Source/core/editing/FrameSelection.h
@@ -146,7 +146,7 @@ public:
     Position start() const { return m_selection.start(); }
     Position end() const { return m_selection.end(); }
 
-    // Return the renderer that is responsible for painting the caret (in the selection start node)
+    // Return the layoutObject that is responsible for painting the caret (in the selection start node)
     LayoutBlock* caretLayoutObject() const;
 
     // Bounds of (possibly transformed) caret in absolute coords