Move kernel baseline tests to front_end.

pkg/front_end/testcases/accessors.dart.direct.expect

 library;
 import self as self;
 import "dart:core" as core;
 
 class C extends core::Object {
   constructor •() → void
     : super core::Object::•()
     ;
   set onlySetter(dynamic value) → void {
     core::print("C.onlySetter called with ${value}.");
@@ skipping 31 matching lines @@
     core::print(throw new core::NoSuchMethodError::•(null, #onlySetter, <dynamic>[], <dynamic, dynamic>{}, null));
     throw "No error thrown";
   }
   on core::NoSuchMethodError catch(final dynamic e) {
     core::print("Expected error: ${e}");
   }
   self::onlySetter = "fisk";
   new self::C::•().testC();
   new self::D::•().testD();
 }