Use tighter typing in editing: BreakBlockquoteCommand & Caret

Source/core/editing/BreakBlockquoteCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, 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 155 matching lines @@
         // This is so we can clone ancestor's siblings and place the clones
         // into the clone corresponding to the ancestor's parent.
         RefPtrWillBeRawPtr<Element> ancestor = nullptr;
         RefPtrWillBeRawPtr<Element> clonedParent = nullptr;
         for (ancestor = ancestors.first(), clonedParent = clonedAncestor->parentElement();
              ancestor && ancestor != topBlockquote;
              ancestor = ancestor->parentElement(), clonedParent = clonedParent->parentElement())
             moveRemainingSiblingsToNewParent(ancestor->nextSibling(), 0, clonedParent);
 
         // If the startNode's original parent is now empty, remove it
-        Node* originalParent = ancestors.first().get();
+        Element* originalParent = ancestors.first().get();
         if (!originalParent->hasChildren())
             removeNode(originalParent);
     }
 
     // Make sure the cloned block quote renders.
     addBlockPlaceholderIfNeeded(clonedBlockquote.get());
 
     // Put the selection right before the break.
     setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
     rebalanceWhitespace();
 }
 
 } // namespace blink