Fix leaking QWebEngineUrlRequestJob reply

BUG: 403129
FIXED-IN: 3.1.0

src/lib/network/schemehandlers/extensionschemehandler.cpp

@@ -24,7 +24,7 @@
 // ExtensionSchemeHandler
 void ExtensionSchemeHandler::setReply(QWebEngineUrlRequestJob *job, const QByteArray &contentType, const QByteArray &content)
 {
-    QBuffer *buffer = new QBuffer();
+    QBuffer *buffer = new QBuffer(job);
     buffer->open(QIODevice::ReadWrite);
     buffer->write(content);
     buffer->seek(0);

src/lib/network/schemehandlers/falkonschemehandler.cpp

@@ -55,7 +55,7 @@ void FalkonSchemeHandler::requestStarted(QWebEngineUrlRequestJob *job)
     knownPages << "about" << "start" << "speeddial" << "config" << "restore";
 
     if (knownPages.contains(job->requestUrl().path()))
-        job->reply(QByteArrayLiteral("text/html"), new FalkonSchemeReply(job));
+        job->reply(QByteArrayLiteral("text/html"), new FalkonSchemeReply(job, job));
     else
         job->fail(QWebEngineUrlRequestJob::UrlInvalid);
 }

src/plugins/KDEFrameworksIntegration/kioschemehandler.cpp

@@ -57,6 +57,7 @@ void KIOSchemeHandler::requestStarted(QWebEngineUrlRequestJob *job)
             qWarning() << "Error:" << reply->errorString();
             job->fail(QWebEngineUrlRequestJob::RequestFailed);
         } else {
+            reply->setParent(job);
             job->reply(reply->header(QNetworkRequest::ContentTypeHeader).toByteArray(), reply);
         }
     });