Fix Bug 931098 Gradient Button Backgrounds
Fix Bug 931098 Gradient Button Backgrounds

Removes gradients added by some browsers to buttons by default.

chirilo/lumbergh,ziir/lumbergh,chirilo/lumbergh,glogiotatidis/lumbergh,mozilla/lumbergh,alexgibson/lumbergh,glogiotatidis/lumbergh,mozilla/lumbergh,chirilo/lumbergh,mozilla/lumbergh,ziir/lumbergh,alexgibson/lumbergh,glogiotatidis/lumbergh,mozilla/lumbergh,bensternthal/lumbergh,ziir/lumbergh,chirilo/lumbergh,alexgibson/lumbergh,bensternthal/lumbergh,glogiotatidis/lumbergh,bensternthal/lumbergh,ziir/lumbergh,alexgibson/lumbergh