Move kernel baseline tests to front_end.

pkg/kernel/testcases/spec-mode/named_parameters.baseline.txt

-library;
-import self as self;
-import "dart:core" as core;
-
-class Superclass extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  method foo({dynamic alpha, dynamic beta}) → dynamic {}
-  method bar({dynamic beta, dynamic alpha}) → dynamic {}
-  method namedCallback(({alpha: core::String, beta: core::int}) → dynamic callback) → dynamic {
-    callback.call(alpha: "one", beta: 2);
-    callback.call(beta: 1, alpha: "two");
-  }
-}
-class Subclass extends self::Superclass {
-  constructor •() → void
-    : super self::Superclass::•()
-    ;
-  method foo({dynamic beta, dynamic alpha}) → dynamic {}
-  method bar({dynamic alpha, dynamic beta}) → dynamic {}
-  method namedCallback(({alpha: core::String, beta: core::int}) → dynamic callback) → dynamic {}
-}
-static method topLevelNamed(dynamic beta, dynamic alpha, {dynamic gamma, dynamic delta}) → dynamic {}
-static method topLevelOptional(dynamic beta, dynamic alpha, [dynamic gamma, dynamic delta]) → dynamic {}
-static method main() → dynamic {
-  new self::Subclass::•().foo(beta: 1, alpha: 2);
-  new self::Subclass::•().foo(alpha: 1, beta: 2);
-  self::topLevelNamed(1, 2, gamma: 3, delta: 4);
-  self::topLevelNamed(1, 2, delta: 3, gamma: 4);
-}