[React] remove deprecated Component.update()

Summary: Since grepping for `update` and `updateAll` is pretty hard, I had these these functions call through but complain loudly. This noisy call through has been in prod for over a week and I haven't heard any complains, so let's take it out altogether.

src/core/ReactComponent.js

@@ -480,24 +480,4 @@ var ReactComponent = {
 
 };
 
-function logDeprecated(msg) {
-  if (__DEV__) {
-    throw new Error(msg);
-  } else {
-    console && console.warn && console.warn(msg);
-  }
-}
-
-/**
- * @deprecated
- */
-ReactComponent.Mixin.update = function(props) {
-  logDeprecated('this.update() is deprecated. Use this.setProps()');
-  this.setProps(props);
-};
-ReactComponent.Mixin.updateAll = function(props) {
-  logDeprecated('this.updateAll() is deprecated. Use this.replaceProps()');
-  this.replaceProps(props);
-};
-
 module.exports = ReactComponent;