Update snowshoe to API changes in QtWebKit
Update snowshoe to API changes in QtWebKit

Download is now at experimental and navigation request is handled by a
signal now.

Reviewed-by: Jesus Sanchez-Palencia

snowshoe/snowshoe,qtproject/qt-apps-snowshoe,qtproject/qt-apps-snowshoe,snowshoe/snowshoe,qtproject/qt-apps-snowshoe,snowshoe/snowshoe