Bug 1276438 part 1. Move the implementation of the .body getter from nsHTMLDocument to nsIDocument. r=mystor

MozReview-Commit-ID: BhQuGS1NdmQ

dom/html/nsHTMLDocument.cpp

@@ -1076,26 +1076,6 @@ nsHTMLDocument::SetDomain(const nsAString& aDomain, ErrorResult& rv)
   rv = NodePrincipal()->SetDomain(newURI);
 }
 
-nsGenericHTMLElement*
-nsHTMLDocument::GetBody()
-{
-  Element* html = GetHtmlElement();
-  if (!html) {
-    return nullptr;
-  }
-
-  for (nsIContent* child = html->GetFirstChild();
-       child;
-       child = child->GetNextSibling()) {
-    if (child->IsHTMLElement(nsGkAtoms::body) ||
-        child->IsHTMLElement(nsGkAtoms::frameset)) {
-      return static_cast<nsGenericHTMLElement*>(child);
-    }
-  }
-
-  return nullptr;
-}
-
 NS_IMETHODIMP
 nsHTMLDocument::GetBody(nsIDOMHTMLElement** aBody)
 {