This is a very simple mod to hide the border on the chat edit box. Credit for the code goes to dylanm... I just packaged this to work as a mod. I have only tested this to work with Basic Chat Mods but should work ok with other chat mods as long as the other mod in use isn't also trying to change the border as well. Installation is the same as any other mod... just unzip the file to your addons folder.
This mod works fine for me in beta... just be sure to check the "load out of date" option at the addons screen. I'll be sure to update the version when the expansion goes live. Also please be sure to let me know if you encounter any problems.