Blink (Chrome) is a fork of WebKit which is a fork of KHTML (Konqueror), but that is a very much different situation. None of the Chromium/WebKit-based browsers are full forks but rather merge custom patches with upstream development. They don't have the development capacity to go against any Google changes except for a few things here and there. Meanwhile Google isn't relying on KDE to develop new features - in fact KDE isn't developing any new KHTML features but instead is switching (or has switched) to WebKit/Blink.