src/vs/workbench/browser/parts/statusbar/statusbarPart.ts/StatusbarPart/overrideStyle
class StatusbarPart:	overrideStyle(style: IStatusbarStyleOverride): IDisposable {
		this.styleOverrides.add(style);
		this.updateStyles();

		return toDisposable(() => {
			this.styleOverrides.delete(style);
			this.updateStyles();
		});
	}