Short answer: You can't.
Long answer: You can, but you will have to alter Chromium's source code and compile it yourself. Usually you would disable such keyboard combinations in Chrome/Chromium by overloading them with a Javascript function, but the Chrome developers have decided that certain combinations, including Ctrl+N, should not be overloaded and disabled this feature for these combinations. So, unless you alter the source code and compile your own Chromium you are out of luck.
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