I know that there are roms that can add the menus button permanently to the nav bar (PA can do this) but I have never seen one get rid of the menu overflow button within any apps themselves. Even back to 4.2 roms I never saw that type of behavior.
In fact now that I think about it when I still had my GS3 which has a physical menu button there still was the menu overflow button in some apps because that is what Google's app guidelines say to do.
Edit - I think what you are seeing about the htc one is about removing the black onscreen nav bar that shows up in apps that don't use the menu overflow button on app because the htc one has hardware keys but not a menu key.
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