Use tighter typing in editing: markup

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index e8a1a598f7eb8bfb67a847de39e337722029ec65..93d03f6030f574154778db20a387680ed4f146ff 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -2267,10 +2267,10 @@ void Element::setOuterHTML(const String& html, ExceptionState& exceptionState)
     parent->replaceChild(fragment.release(), this, exceptionState);
     RefPtrWillBeRawPtr<Node> node = next ? next->previousSibling() : 0;
     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);
 }
 
 Node* Element::insertAdjacent(const String& where, Node* newChild, ExceptionState& exceptionState)