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

Depends on D66032

Differential Revision: https://phabricator.services.mozilla.com/D66033

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

dom/websocket/WebSocket.cpp

@@ -886,7 +886,7 @@ WebSocket::WebSocket(nsIGlobalObject* aGlobal)
   mIsMainThread = mImpl->mIsMainThread;
 }
 
-WebSocket::~WebSocket() {}
+WebSocket::~WebSocket() = default;
 
 JSObject* WebSocket::WrapObject(JSContext* cx,
                                 JS::Handle<JSObject*> aGivenProto) {