[Merge] lp:~abreu-alexandre/webbrowser-app/webapp-properties-ua-override-fix-rtm-14.09 into lp:webbrowser-app/rtm-14.09

[Olivier Tilloy]

Review: Disapprove

Not needed any longer, as the entire trunk was backported to RTM.
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/webapp-properties-ua-override-fix-rtm-14.09/+merge/243834
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