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

[Arthur Mello]

> tried this out and there is one problem:
> 
> - for webapps (tested amazon and gmail), the state save/restore works only
> once and does not work correctly the second time
> To test:
> - open amazon
> - navigate to a page
> - kill -2 on the pid
> - relaunch amazon
> - verify that the last url was restored
> - then navigate to a different page
> - kill -2 on the pid
> - relaunch amazon
> - the first url that was saved is restored, not the last visited page
> 
> This works fine for webbrowser-app, just not webapps

Seems to work on r635
-- 
https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-statesaver/+merge/227737
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