Buy some steel rod and _make_ it L-shaped. Any decent hardware store should offer any number of things that would do:

- Mild steel rod (won't be chromed, but will work)
- Long hex or carriage bolt
- Paint roller or other inexpensive tool handle
- Wire shelving or storage wall components

A block of wood and a vice would be helpful, but neither are required. I'd bend it, then cut it to length with a hacksaw for best precision.

For the tool-challenged, you could simply lay the rod on the ground under a 2x4 block and have someone stand on the block (or park your car on it). Bend away. An adjustable wrench works well as a lever.

You could also stick the rod in a sidewalk crack. Same principle. DIYers gotta get creative sometimes.

There's enough clearance in that table that it needn't be perfectly radiused. Overbending slightly and bending back to 90° can help tighten the curve, though. 

If you end up with curvature in the legs, lay them on a block, arched upward, and tap them with a hammer. They'll straighten right out.