Kill ReactLink, LinkedStateMixin, valueLink and checkedLink (#8165)

This should be safe because we've been warning for this. The LinkedStateMixin is technically exposed on React.addons without a warning but presumably you wouldn't be using it without a valueLink or checkedLink.

I do this primarily to clear up what the custom onChange listeners are doing.

Renamed the final prop type helper to ReactControlledValuePropTypes.

Author: sebmarkbage

src/addons/ReactWithAddons.js

@@ -11,7 +11,6 @@
 
 'use strict';
 
-var LinkedStateMixin = require('LinkedStateMixin');
 var React = require('React');
 var ReactAddonsDOMDependencies = require('ReactAddonsDOMDependencies');
 var ReactComponentWithPureRenderMixin =
@@ -25,7 +24,6 @@ var update = require('update');
 
 React.addons = {
   CSSTransitionGroup: ReactCSSTransitionGroup,
-  LinkedStateMixin: LinkedStateMixin,
   PureRenderMixin: ReactComponentWithPureRenderMixin,
   TransitionGroup: ReactTransitionGroup,
 

src/addons/link/LinkedStateMixin.js

@@ -26,9 +26,7 @@ if (__DEV__) {
 
     autoFocus: true,
     defaultValue: true,
-    valueLink: true,
     defaultChecked: true,
-    checkedLink: true,
     innerHTML: true,
     suppressContentEditableWarning: true,
     onFocusIn: true,