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

[Olivier Tilloy]

Rae requested the text color of the button to be changed to white in private mode, but there is currently no way to control the text color of a button (see bug #1357332). Top-approving as it is, thanks!
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https://code.launchpad.net/~rpadovani/webbrowser-app/new-tab-private-mode/+merge/262590
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