Remote inspection no longer available after Chrome M50

Remote inspector no more avaiable with latest Chrome update M50, due to Object.Observe feature deprecation, QTWEBENGINE_REMOTE_DEBUGGING is no more applicable:

'Object.observe' is deprecated and will be removed in M50, around April 2016. See https://www.chromestatus.com/features/6147094632988672 for more details. Injector.js

WA: use a previous chrome version like M49: https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Win/369909/