Use tighter typing in editing: markup

Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 429 matching lines @@
     if (!parentNode())
         exceptionState.throwDOMException(HierarchyRequestError, "The element has no parent.");
 
     if (exceptionState.hadException())
         return;
 
     parent->replaceChild(newChild.release(), this, exceptionState);
 
     RefPtrWillBeRawPtr<Node> node = next ? next->previousSibling() : nullptr;
     if (!exceptionState.hadException() && node && node->isTextNode())
-        mergeWithNextTextNode(node.release(), exceptionState);
+        mergeWithNextTextNode(toText(node.get()), exceptionState);
 
     if (!exceptionState.hadException() && prev && prev->isTextNode())
-        mergeWithNextTextNode(prev.release(), exceptionState);
+        mergeWithNextTextNode(toText(prev.get()), exceptionState);
 }
 
 void HTMLElement::applyAlignmentAttributeToStyle(const AtomicString& alignment, MutableStylePropertySet* style)
 {
     // Vertical alignment with respect to the current baseline of the text
     // right or left means floating images.
     CSSValueID floatValue = CSSValueInvalid;
     CSSValueID verticalAlignValue = CSSValueInvalid;
 
     if (equalIgnoringCase(alignment, "absmiddle"))
@@ skipping 494 matching lines @@
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(blink::HTMLElement*);
 
 void dumpInnerHTML(blink::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif