Strip more unused features.

test/e2e/lib.ts

-import {CONST, CONST_EXPR, forwardRef} from 'angular2/src/facade/lang';
-
-@CONST
 export class MyClass {
   private error: string = 'error';
   constructor(private ctorField: string) {}
 
   get field(): string {
     // TODO: TypeScript doesn't parse the RHS as StringKeyword so we lose
     // the translation of string -> String.
     // We use capital S String here, even though it wouldn't run in TS.
     if ((<any>' world') instanceof String) {
       return this.ctorField + ' world';
     } else {
       return this.error;
     }
   }
 
   namedParam({x = '?'}: any = {}) { return 'hello' + x; }
 }
 
 interface Observer {
   update(o: Object, arg: Object);
 }
 
 export class MySubclass extends MyClass implements Observer {
   constructor(ctorField: string) { super(ctorField); }
   get subclassField(): string { return this.field; }
   update(o: Object, arg: Object) { this.field = arg.toString(); }
 }
 
-export const SOME_ARRAY = CONST_EXPR([1, 2, 3]);
-export const someArray = forwardRef(() => SOME_ARRAY);
+export const SOME_ARRAY = [1, 2, 3];
+export const someArray = SOME_ARRAY;