I have built chromium based on chromium.org. Now I need to modify the UI. I need to hide(remove) the address bar and also I need to disable the right click option. Could you please suggest (explain) which file I need to edit in-order to do this tasks.
I'm not on my Ubuntu system right now, so I can't check it, but you should be able to run chromium in Kiosk mode. It's a command-line switch "--kiosk". This will disable the address bar for you.
For your reference, here's a full list of Chromium command line switches