Bug 1600451 - Port bug 1600362: add namespace to Element class. r=KaiE

mailnews/base/src/nsMsgContentPolicy.cpp

@@ -712,7 +712,7 @@ void nsMsgContentPolicy::ComposeShouldLoad(nsIMsgCompose *aMsgCompose,
     if (*aDecision == nsIContentPolicy::REJECT_REQUEST) {
       bool insertingQuotedContent = true;
       aMsgCompose->GetInsertingQuotedContent(&insertingQuotedContent);
-      nsCOMPtr<Element> element = do_QueryInterface(aRequestingContext);
+      nsCOMPtr<mozilla::dom::Element> element = do_QueryInterface(aRequestingContext);
       RefPtr<mozilla::dom::HTMLImageElement> image =
           mozilla::dom::HTMLImageElement::FromNodeOrNull(element);
       if (image) {

mailnews/base/src/nsMsgMailSession.cpp

@@ -259,7 +259,7 @@ nsresult nsMsgMailSession::GetTopmostMsgWindow(nsIMsgWindow **aMsgWindow) {
       mozilla::dom::Document *domDocument = topMostWindow->GetDoc();
       NS_ENSURE_TRUE(domDocument, NS_ERROR_FAILURE);
 
-      Element *domElement = domDocument->GetDocumentElement();
+      mozilla::dom::Element *domElement = domDocument->GetDocumentElement();
       NS_ENSURE_TRUE(domElement, NS_ERROR_FAILURE);
 
       domElement->GetAttribute(NS_LITERAL_STRING("windowtype"), windowType);