Here is a guide I did a while back to change it on the thunderbolt using a simple build.prop mod http://androidforums.com/3034521-post18.html it is pretty much the same on the Gnex, if needed I can get some screens for the Gnex tonight.
Keep in mind your build.prop will look a little different because the device isn't the same and the default value on the Gnex is 320 not 240. From what I can tell most people who change it are going to 240 or 241.
The only line of code you are looking for is "ro.sf.lcd_density=320" just change the 320 to a different number and reboot.
Disclaimer: Some apps do not like the mod and it may make other apps not available in your market.
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