[Merge] lp:~osomon/webbrowser-app/no-loadingChanged into lp:webbrowser-app

[Olivier Tilloy]

Addressed, and added unit tests for ChromeController.
Thanks for the review!
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https://code.launchpad.net/~osomon/webbrowser-app/no-loadingChanged/+merge/283997
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~osomon/webbrowser-app/no-loadingChanged into lp:webbrowser-app.