/usr/include/qt5/QtWebKitWidgets/ is in libqt5webkit5-dev 5.1.1-1ubuntu8.
This file is owned by root:root, with mode 0o755.
..
/usr/include/qt5/QtWebKitWidgets/5.1.1/
/usr/include/qt5/QtWebKitWidgets/5.1.1/QtWebKitWidgets/
/usr/include/qt5/QtWebKitWidgets/5.1.1/QtWebKitWidgets/private/
/usr/include/qt5/QtWebKitWidgets/5.1.1/QtWebKitWidgets/private/qwebframe_p.h
/usr/include/qt5/QtWebKitWidgets/5.1.1/QtWebKitWidgets/private/qwebinspector_p.h
/usr/include/qt5/QtWebKitWidgets/5.1.1/QtWebKitWidgets/private/qwebpage_p.h
/usr/include/qt5/QtWebKitWidgets/5.1.1/QtWebKitWidgets/private/qwebviewaccessible_p.h
/usr/include/qt5/QtWebKitWidgets/QGraphicsWebView
/usr/include/qt5/QtWebKitWidgets/QWebFrame
/usr/include/qt5/QtWebKitWidgets/QWebHitTestResult
/usr/include/qt5/QtWebKitWidgets/QWebInspector
/usr/include/qt5/QtWebKitWidgets/QWebPage
/usr/include/qt5/QtWebKitWidgets/QWebView
/usr/include/qt5/QtWebKitWidgets/QtWebKitWidgets
/usr/include/qt5/QtWebKitWidgets/QtWebKitWidgetsDepends
/usr/include/qt5/QtWebKitWidgets/QtWebKitWidgetsVersion
/usr/include/qt5/QtWebKitWidgets/qgraphicswebview.h
/usr/include/qt5/QtWebKitWidgets/qtwebkitwidgetsversion.h
/usr/include/qt5/QtWebKitWidgets/qwebframe.h
/usr/include/qt5/QtWebKitWidgets/qwebinspector.h
/usr/include/qt5/QtWebKitWidgets/qwebpage.h
/usr/include/qt5/QtWebKitWidgets/qwebview.h