[Merge] lp:~abreu-alexandre/webbrowser-app/user-agent-override-fails into lp:webbrowser-app

[Olivier Tilloy]

Review: Approve

LGTM now. Note that I filed bug #1399601 to track the issue with getUAString() being racy by design.
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/user-agent-override-fails/+merge/243286
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