[Merge] lp:~uriboni/webbrowser-app/addressbar-load-no-clear into lp:webbrowser-app

[Olivier Tilloy]

The change otherwise looks good, I’ll play further with it on my device to convince myself that it doesn’t introduce any regression (this code is not exactly as robust as I’d like it to be, despite the unit tests and autopilot tests).
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https://code.launchpad.net/~uriboni/webbrowser-app/addressbar-load-no-clear/+merge/275347
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