Lots of API changes due to implementing support for NetworkService

[cztomczak]

Lots of API changes are on the way.

Upstream issue:
https://bitbucket.org/chromiumembedded/cef/issues/2622/implement-support-for-networkservice

Related commits so far:

1. https://bitbucket.org/chromiumembedded/cef/commits/6b2c1fe9693fd4e14cfb7c4ddc56cc9105c67f9a
2. https://bitbucket.org/chromiumembedded/cef/commits/a23e8452443d170b57c7827ed0a4a4b35d39b65c
3. https://bitbucket.org/chromiumembedded/cef/commits/ea27dff33839d725c24ef1870c9f3d91f5833a82
4. https://bitbucket.org/chromiumembedded/cef/commits/9b43d265c38dd55f2a1cd21428db565379032f4e
5. https://bitbucket.org/chromiumembedded/cef/commits/b65f336f812611ebe36caae3abf7b05badf60e27
6. https://bitbucket.org/chromiumembedded/cef/commits/8f240861e30882ee8052a601d8670c3a3a6a11fc