[Merge] lp:~abreu-alexandre/webbrowser-app/container-handle-camera-access into lp:webbrowser-app

[Alexandre Abreu]

I updated the branch to fix the work around the crasher. As of now, it has been diagnosed as being oxide related, when a webview overrides a given context and the messageHandlers list, I will find a minimum example to repro the issue and file an oxide bug
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/container-handle-camera-access/+merge/288571
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