[Merge] lp:~ahayzen/webbrowser-app/fix-1633040-add-js-dialog-ap-tests into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Approve

LGTM now, thanks!
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https://code.launchpad.net/~ahayzen/webbrowser-app/fix-1633040-add-js-dialog-ap-tests/+merge/308392
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