[Merge] lp:~uriboni/webbrowser-app/topsite-previews into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

I can reliably reproduce the following issue:

 - ensure that webbrowser-app is not running
 - rm $HOME/.cache/webbrowser-app/captures/*
 - launch webbrowser-app, open a new tab, verify that there are no captures
 - open each top site in a new tab, and ensure that they all have a capture displayed
 - close all tabs, when the last tab is closed, the app quits
 - verify that you have (at least) 10 captures in $HOME/.cache/webbrowser-app/captures
 - launch webbrowser-app again, and open a new tab
 - the captures are gone, for some (wrong) reason they’ve been purged from the cache
-- 
https://code.launchpad.net/~uriboni/webbrowser-app/topsite-previews/+merge/269771
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