Disabled color is hardcoded to grey instead of using either decoration or theme #174
Description
Most colors are properly configurable using the various decorations, or use theme colors. Except for disabled state, colors are hardcoded to Colors.grey (for the prefix icon) and Colors.grey.shade100 (for the chip). Why not provide e.g. chipDecoration.disabledColor, or at least use Theme.of(context).disabledColor?