WebView: Remove QWebChannel resetting workaround

It was fixed while ago in Qt

src/lib/webengine/webpage.cpp

@@ -73,7 +73,9 @@ WebPage::WebPage(QObject* parent)
     , m_secureStatus(false)
     , m_adjustingScheduled(false)
 {
-    setupWebChannel();
+    QWebChannel *channel = new QWebChannel(this);
+    channel->registerObject(QSL("qz_object"), new ExternalJsObject(this));
+    setWebChannel(channel);
 
     connect(this, &QWebEnginePage::loadProgress, this, &WebPage::progress);
     connect(this, &QWebEnginePage::loadFinished, this, &WebPage::finished);
@@ -312,21 +314,6 @@ void WebPage::desktopServicesOpen(const QUrl &url)
     }
 }
 
-void WebPage::setupWebChannel()
-{
-    QWebChannel *old = webChannel();
-    const QString objectName = QSL("qz_object");
-
-    QWebChannel *channel = new QWebChannel(this);
-    channel->registerObject(QSL("qz_object"), new ExternalJsObject(this));
-    setWebChannel(channel);
-
-    if (old) {
-        delete old->registeredObjects().value(objectName);
-        delete old;
-    }
-}
-
 void WebPage::windowCloseRequested()
 {
     if (!view())

src/lib/webengine/webpage.h

@@ -69,8 +69,6 @@ public:
 
     bool isLoading() const;
 
-    void setupWebChannel();
-
 signals:
     void privacyChanged(bool status);
 

src/lib/webengine/webview.cpp

@@ -262,9 +262,6 @@ void WebView::restoreHistory(const QByteArray &data)
 {
     QDataStream stream(data);
     stream >> *history();
-
-    // Workaround clearing QWebChannel after restoring history
-    page()->setupWebChannel();
 }
 
 QWidget *WebView::inputWidget() const