Bug 1613985 - Use default for equivalent-to-default constructors/destructors in dom/crypto. r=smaug

Depends on D62572

Differential Revision: https://phabricator.services.mozilla.com/D62573

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

dom/crypto/CryptoKey.h

@@ -165,7 +165,7 @@ class CryptoKey final : public nsISupports, public nsWrapperCache {
       JSStructuredCloneReader* aReader);
 
  private:
-  ~CryptoKey() {}
+  ~CryptoKey() = default;
 
   RefPtr<nsIGlobalObject> mGlobal;
   uint32_t mAttributes;  // see above