The higgs field is thought to theoretically be responsible for mass. Mass is in turn responsible for inertia which limits motion. I therefore believe that the higgs field could itself be responsible for the upper speed limit of the universe. Therefore if the higgs field was removed, light could probably travel faster than 300,000,000 m/s. This could be done by placing a very large mass in space causing it bend space. If the higgs field was likened to sand particles glued unto a flexible plastic, and this plastic was bent by applying a force, the distance between the sand particles would increase. in case of the higgs field placing a large mass in space cause the space between the higgs bosons to increasing creating a less limited pathway for photons thus making them travel above their normal speed.
I also believe that light might speed rather than slow near a black hole despite the fact that it might be observed to slow. Light might be observed to slow since the motion is relative to the observer and that because it is moving so fast that some light rays which might have escaped may take a longer time to reach the observer thus making motion appear to slow.
