[Merge] lp:~rpadovani/webbrowser-app/new-tab-private-mode into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

The "Done" button border is not visible on the dark background, that doesn’t look good.

The label of the "add" button is not visible either on the dark background.

"#5d5d5d" should be replaced by UbuntuColors.darkGrey.
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https://code.launchpad.net/~rpadovani/webbrowser-app/new-tab-private-mode/+merge/262590
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