chore: replace @CONST() with /*@ts2dart_const*/

modules/angular2/src/facade/lang.dart

@@ -14,10 +14,6 @@ class Math {
   static num min(num a, num b) => math.min(a, b);
 }
 
-class CONST {
-  const CONST();
-}
-
 const IS_DART = true;
 
 scheduleMicroTask(Function fn) {
@@ -398,4 +394,4 @@ num bitWiseAnd(List values) {
 
 String escape(String s) {
   return Uri.encodeComponent(s);
-}
+}

modules/angular2/src/facade/lang.ts

@@ -106,10 +106,6 @@ _global.assert = function assert(condition) {
   // TODO: to be fixed properly via #2830, noop for now
 };
 
-export function CONST(): ClassDecorator & PropertyDecorator {
-  return (target) => target;
-}
-
 export function isPresent(obj: any): boolean {
   return obj !== undefined && obj !== null;
 }