1. Adding the following line to build.prop: "qemu.hw.mainkeys=1" (without quotes). I tried this on the rooted stock JB rom and on Batakang rom. In both cases, the mod causes both navigation bar (bottom of screen) and status bar (top of screen) to disappear, with frequent UI crash messages.
2. Editing the framework-res\res\values\bools.xml and changing the value of ”config_showNavigationBar” from "true" to "false". This is discussed in detail in the following link: http://www.androidincanada.ca/news/m...s-full-screen/ I did not try this mod on rooted stock JB (since I made a flashable zip out of my new framework-res.apk and safestrap won't allow zip installation in the stock slot). I tried this mod only on the Batakang rom. The mod causes both navigation bar (bottom of screen) and status bar (top of screen) to disappear, with frequent UI crash messages, similar to previous mod.
3. In retrospect, I wonder what would have happened if I tried both mods listed above at the same time. It may have worked. I may try this later. But then I installed CM10 beta rom by dhacker and tried the FullScreenToggleV2.apk mod provided in this link: http://forum.xda-developers.com/show....php?t=1497558 This worked like a charm, without any crashes or any disruption of the status bar. This apk inserts the "qemu.hw.mainkeys=1" line in your build.prop (the same as mod #1 listed above) but it's easier since you don't have to manually edit your build.prop. I tried this mod on rooted stock JB rom and Batakang rom, but it had the same (failed) results as in mod #1 above. So it only works for CM10 rom by dhacker on my XT926. I suspect it will also work in CM10 on XT925 (by epinter) but I don't have one to try.
Ideally there would be a mod that would work on the rooted stock JB rom. But short of that, at least it's reassuring that the Razr HD navbar can be removed in the CM10 rom. One could hope it may even be added as a CM10 feature later on
*** Important Note: if you attempt this, obviously you would need another way to navigate through your screens. I use LMT listed under mod #3 link above. There are other options available also. Just make sure to install some app that provides an alternative method of navigation before you try the mod.