[Merge] lp:~dbarth/webbrowser-app/webapp-container.remove-qtwebkit-support into lp:webbrowser-app

[Olivier Tilloy]

Review: Disapprove

Superseded by https://code.launchpad.net/~abreu-alexandre/webbrowser-app/remove-qtwebkit-deps/+merge/254291.
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https://code.launchpad.net/~dbarth/webbrowser-app/webapp-container.remove-qtwebkit-support/+merge/221773
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