Use tighter typing in editing: BreakBlockquoteCommand & Caret

Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1194 matching lines @@
     const bool selectionHasDirection = true;
     setSelection(VisibleSelection(pos.deepEquivalent(), m_selection.extent(), pos.affinity(), selectionHasDirection), CloseTyping | ClearTypingStyle | userTriggered);
 }
 
 void FrameSelection::setExtent(const VisiblePosition &pos, EUserTriggered userTriggered)
 {
     const bool selectionHasDirection = true;
     setSelection(VisibleSelection(m_selection.base(), pos.deepEquivalent(), pos.affinity(), selectionHasDirection), CloseTyping | ClearTypingStyle | userTriggered);
 }
 
-RenderObject* FrameSelection::caretRenderer() const
+RenderBlock* FrameSelection::caretRenderer() const
 {
     return CaretBase::caretRenderer(m_selection.start().deprecatedNode());
 }
 
 static bool isNonOrphanedCaret(const VisibleSelection& selection)
 {
     return selection.isCaret() && !selection.start().isOrphan() && !selection.end().isOrphan();
 }
 
 LayoutRect FrameSelection::localCaretRect()
@@ skipping 670 matching lines @@
     sel.showTreeForThis();
 }
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
 }
 
 #endif