[Merge] lp:~artmello/webbrowser-app/webbrowser-app-bookmarks_top_sites into lp:webbrowser-app

[Arthur Mello]

> If I open a new empty tab, then type in a URL in the address bar and validate,
> I’m getting the following warning:
> 
>     WARNING: Trying to pop an empty PageStack. Ignoring.

Fixed on revision 575
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-bookmarks_top_sites/+merge/224592
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