Remove unused qmlRegisterRevision call

This was used for registering an alternative QtWebEngine.experimental
import, which has however been removed since then (a4dcc5b4

).

Change-Id: I0edd869fcc0057b2c6a4932eb39cb8f739f571bc
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/webengine/api/qquickwebengineview_p.h

@@ -98,8 +98,6 @@ private:
     const bool m_toggleOn;
 };
 
-#define LATEST_WEBENGINEVIEW_REVISION 5
-
 class Q_WEBENGINE_PRIVATE_EXPORT QQuickWebEngineView : public QQuickItem {
     Q_OBJECT
     Q_PROPERTY(QUrl url READ url WRITE setUrl NOTIFY urlChanged FINAL)

src/webengine/plugin/plugin.cpp

@@ -129,9 +129,6 @@ public:
                                                                          msgUncreatableType("FileDialogRequest"));
         qmlRegisterUncreatableType<QQuickWebEngineFormValidationMessageRequest>(uri, 1, 4, "FormValidationMessageRequest",
                                                                          msgUncreatableType("FormValidationMessageRequest"));
-
-        // For now (1.x import), the latest revision matches the minor version of the import.
-        qmlRegisterRevision<QQuickWebEngineView, LATEST_WEBENGINEVIEW_REVISION>(uri, 1, LATEST_WEBENGINEVIEW_REVISION);
     }
 
 private: