Use tighter typing in editing/

Source/core/editing/FormatBlockCommand.cpp

 /*
  * Copyright (C) 2006 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 41 matching lines @@
 }
 
 void FormatBlockCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
 {
     if (!isElementForFormatBlock(tagName()))
         return;
     ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
     m_didApply = true;
 }
 
-void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<Element>& blockNode)
+void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<HTMLElement>& blockNode)
 {
     Element* refNode = enclosingBlockFlowElement(VisiblePosition(end));
     Element* root = editableRootForPosition(start);
     // Root is null for elements with contenteditable=false.
     if (!root || !refNode)
         return;
 
     Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.deprecatedNode());
     RefPtrWillBeRawPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo).get();
     RefPtrWillBeRawPtr<Node> nodeAfterInsertionPosition = outerBlock;
@@ skipping 87 matching lines @@
             return n;
         if (isBlock(n))
             lastBlock = n;
         if (isListElement(n))
             return n->parentNode()->hasEditableStyle() ? n->parentNode() : n;
     }
     return lastBlock;
 }
 
 }