Use toElement instead of static_cast<Element*> and static_cast<const Element*>

Source/core/editing/ApplyStyleCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 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 1291 matching lines @@
             return false;
 
         endNode = end.deprecatedNode()->parentNode();
     }
 
     if (!endNode->isElementNode() || endNode->hasTagName(brTag))
         return false;
 
     Node* nextSibling = endNode->nextSibling();
     if (nextSibling && areIdenticalElements(endNode, nextSibling)) {
-        Element* nextElement = static_cast<Element *>(nextSibling);
-        Element* element = static_cast<Element *>(endNode);
+        Element* nextElement = toElement(nextSibling);
+        Element* element = toElement(endNode);
         Node* nextChild = nextElement->firstChild();
 
         mergeIdenticalElements(element, nextElement);
 
         bool shouldUpdateStart = start.containerNode() == endNode;
         int endOffset = nextChild ? nextChild->nodeIndex() : nextElement->childNodes()->length();
         updateStartEnd(shouldUpdateStart ? Position(nextElement, start.offsetInContainerNode(), Position::PositionIsOffsetInAnchor) : start,
                        Position(nextElement, endOffset, Position::PositionIsOffsetInAnchor));
         return true;
     }
@@ skipping 216 matching lines @@
         String textToMove = nextText->data();
         insertTextIntoNode(childText, childText->length(), textToMove);
         removeNode(next);
         // don't move child node pointer. it may want to merge with more text nodes.
     }
 
     updateStartEnd(newStart, newEnd);
 }
 
 }