[Merge] lp:~daker/webbrowser-app/fix.airbnb-smartbanner into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

Unfortunately it still doesn’t work for me. This is how I test it:

 - ensure the browser is closed, delete the cookie db: `rm ~/.local/share/webbrowser-app/cookies.sqlite*`
 - start the browser, enter "http://airbnb.com" in the address bar, validate

The banner advertising the android app shows up.
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https://code.launchpad.net/~daker/webbrowser-app/fix.airbnb-smartbanner/+merge/230855
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