[Merge] lp:~fboucault/webbrowser-app/combo_box_better_ux into lp:webbrowser-app/staging

[Olivier Tilloy]

WebView::viewport{Width,Height} are deprecated properties. For the height of the address bar, use WebView::locationBarController::height.
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https://code.launchpad.net/~fboucault/webbrowser-app/combo_box_better_ux/+merge/316571
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