[Merge] lp:~osomon/webbrowser-app/disable-favicon-provider-rtm into lp:webbrowser-app/rtm-14.09

[Olivier Tilloy]

Following Florian’s suggestions, I replaced the custom favicon image provider with a FaviconFetcher component that better handles cancelling pending requests. It is fully unit-tested, including the use-case of emitting numerous queries in a row and ensuring that they are cancelled as a new one comes in.
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https://code.launchpad.net/~osomon/webbrowser-app/disable-favicon-provider-rtm/+merge/242757
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