Add CaretBase::m_caretPainter, and compute caretBrowsing lazily.

Source/core/editing/FrameSelection.cpp

Index: Source/core/editing/FrameSelection.cpp
diff --git a/Source/core/editing/FrameSelection.cpp b/Source/core/editing/FrameSelection.cpp
index 249dbe2971a8aef46f5b1312110060470eb50b9f..81b654987dd35b6807f8de259e5c8d362815526e 100644
--- a/Source/core/editing/FrameSelection.cpp
+++ b/Source/core/editing/FrameSelection.cpp
@@ -1248,11 +1248,6 @@ void FrameSelection::setExtent(const VisiblePosition &pos, EUserTriggered userTr
     setSelection(VisibleSelection(m_selection.base(), pos.deepEquivalent(), pos.affinity(), selectionHasDirection), CloseTyping | ClearTypingStyle | userTriggered);
 }
 
-LayoutBlock* FrameSelection::caretLayoutObject() const
-{
-    return CaretBase::caretLayoutObject(m_selection.start().deprecatedNode());
-}
-
 static bool isNonOrphanedCaret(const VisibleSelection& selection)
 {
     return selection.isCaret() && !selection.start().isOrphan() && !selection.end().isOrphan();