refactor(ChandeDetection): Rename ChangeDetectorRef.markForCheck

BREAKING CHANGE

Closes #3403

- ChangeDetectorRef.requestCheck() => ChangeDetectorRef.markForCheck()

modules/angular2/test/core/compiler/integration_spec.ts

@@ -1685,7 +1685,7 @@ class PushCmpWithRef {
     return "fixed";
   }
 
-  propagate() { this.ref.requestCheck(); }
+  propagate() { this.ref.markForCheck(); }
 }
 
 @Component({selector: 'push-cmp-with-async', changeDetection: ChangeDetectionStrategy.OnPush})

modules/angular2/test/core/directives/observable_list_diff_spec.dart

@@ -73,7 +73,7 @@ main() {
       c.add(3);
       flushMicrotasks();
 
-      expect(changeDetectorRef.spy("requestCheck")).toHaveBeenCalledOnce();
+      expect(changeDetectorRef.spy("markForCheck")).toHaveBeenCalledOnce();
     }));
 
     it("should return the wrapped value after changing a collection", () {