Bug 1613985 - Use default for equivalent-to-default constructors/destructors in editor. r=masayuki

Differential Revision: https://phabricator.services.mozilla.com/D65287

--HG--
extra : moz-landing-system : lando

editor/libeditor/HTMLEditor.h

@@ -3563,7 +3563,7 @@ class HTMLEditor final : public TextEditor,
     nsresult OnError(const nsAString& aErrorName);
 
    private:
-    ~BlobReader() {}
+    ~BlobReader() = default;
 
     RefPtr<dom::BlobImpl> mBlob;
     RefPtr<HTMLEditor> mHTMLEditor;

editor/libeditor/ManualNAC.h

@@ -24,7 +24,7 @@ typedef AutoTArray<RefPtr<dom::Element>, 16> ManualNACArray;
  */
 class ManualNACPtr final {
  public:
-  ManualNACPtr() {}
+  ManualNACPtr() = default;
   MOZ_IMPLICIT ManualNACPtr(decltype(nullptr)) {}
   explicit ManualNACPtr(already_AddRefed<dom::Element> aNewNAC)
       : mPtr(aNewNAC) {