[Merge] lp:~abreu-alexandre/webbrowser-app/front-camera-as-default-capture into lp:webbrowser-app

[Alexandre Abreu]

> Is the 'defaultVideoCaptureMediaIdUpdated' signal really needed? Can we not
> connect to currentWebviewContext.onDefaultVideoCaptureDeviceIdChanged instead?

no, the intent is to update the *initial* settings when none have been set so that it
properly reflects the current device id.
This should not be done for every video capture device changed since this part
is handled by the settings page itself,

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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/front-camera-as-default-capture/+merge/291527
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