refactor(facade): inline StringWrapper (#12051)

modules/playground/src/web_workers/kitchen_sink/index_common.ts

@@ -7,8 +7,6 @@
  */
 
 import {Component, Directive, ElementRef, Injectable, Renderer} from '@angular/core';
-import {StringWrapper} from '@angular/core/src/facade/lang';
-
 
 // A service available to the Injector, used by the HelloCmp component.
 @Injectable()
@@ -57,6 +55,6 @@ export class HelloCmp {
   changeGreeting(): void { this.greeting = 'howdy'; }
 
   onKeyDown(event: any /** TODO #9100 */): void {
-    this.lastKey = StringWrapper.fromCharCode(event.keyCode);
+    this.lastKey = String.fromCharCode(event.keyCode);
   }
 }