There are a lot better alternatives out there, get them.
I highly recommend Mesh Machine - it may be a bit too much, but it's great.
Unbevel option is in the mesh edit mode 'W' menu
Improved error handling when selected paths did not contain enough edges to calculate my specific unbevel operation.
Now works with Blender 2.8 Beta. The default now removes the supporting edge. And due to Blender 2.8's menu visual update, the button would appear above the name of the menu, THAT IS NOT OKAY. So I moved it to the bottom of the menu instead.
Simply got rid of an error that started occurring likely after Blender 3.0
If you plan to use this with Blender 2.7 please download version 0.1.