fix(buttons): allow correct ref validation in PropTypes (#396)

Author: Austin Green

packages/buttons/src/views/icon-button/ChevronButton.js

@@ -45,8 +45,6 @@ ChevronButton.propTypes = {
   focusInset: PropTypes.bool,
   hovered: PropTypes.bool,
   active: PropTypes.bool,
-  /** Callback for reference of the native button element */
-  buttonRef: PropTypes.func,
   /** Rotates icon 180 degrees */
   rotated: PropTypes.bool
 };

packages/buttons/src/views/icon-button/IconButton.js

@@ -43,9 +43,7 @@ IconButton.propTypes = {
   disabled: PropTypes.bool,
   focused: PropTypes.bool,
   hovered: PropTypes.bool,
-  active: PropTypes.bool,
-  /** Callback for reference of the native button element */
-  buttonRef: PropTypes.func
+  active: PropTypes.bool
 };
 
 IconButton.defaultProps = {