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

[Olivier Tilloy]

Review: Needs Fixing

The shouldSerializeOnDisk() test function should be updated to also test that entries were correctly inserted in the history_hidden table (revision 994): the test would hide an entry, and after reloading the database from disk would verify that that entry is still hidden.
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-remove_top_sites/+merge/255153
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