This eases the chromium browser upgrade process while ensuring that the
chromium embedded framework is still supported. With this new structure,
chromium.inc contains common code for cef3 and the browser, while
chromium-browser.inc contains common code for browser releases (and itself
includes chromium.inc). The actual .bb files then mainly set several
values (and may contain release specific functions).

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>