[Merge] lp:~osomon/webbrowser-app/gdrive-ua-override-1643386 into lp:webbrowser-app/staging

[Andrew Hayzen]

Note that if you navigate to a document/presentation, which are hosted on docs.google.com, you get a warning at the top of the page stating that the browser is an unsupported version.
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https://code.launchpad.net/~osomon/webbrowser-app/gdrive-ua-override-1643386/+merge/311418
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