Move kernel baseline tests to front_end.

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

Index: pkg/kernel/testcases/spec-mode/covariant_generic.baseline.txt
diff --git a/pkg/kernel/testcases/spec-mode/covariant_generic.baseline.txt b/pkg/kernel/testcases/spec-mode/covariant_generic.baseline.txt
deleted file mode 100644
index 063394e175dbe510d583de36efe92a4bea695fc5..0000000000000000000000000000000000000000
--- a/pkg/kernel/testcases/spec-mode/covariant_generic.baseline.txt
+++ /dev/null
@@ -1,38 +0,0 @@
-library;
-import self as self;
-import "dart:core" as core;
-
-class Foo<T extends core::Object> extends core::Object {
-  final field self::Foo::T finalField;
-  final field (self::Foo::T) → void callbackField;
-  field self::Foo::T mutableField = null;
-  field (self::Foo::T) → void mutableCallbackField = null;
-  constructor •(self::Foo::T finalField, (self::Foo::T) → void callbackField) → void
-    : self::Foo::finalField = finalField, self::Foo::callbackField = callbackField, super core::Object::•()
-    ;
-  method method(self::Foo::T x) → void {}
-  set setter(self::Foo::T x) → dynamic {}
-  method withCallback((self::Foo::T) → void callback) → void {
-    callback.call(this.finalField);
-  }
-}
-static method main() → dynamic {
-  self::Foo<core::int> fooInt = new self::Foo::•<core::int>(1, (core::int x) → dynamic {});
-  fooInt.method(3);
-  fooInt.setter = 3;
-  fooInt.withCallback((core::int x) → dynamic {});
-  fooInt.withCallback((core::num x) → dynamic {});
-  fooInt.mutableField = 3;
-  fooInt.mutableCallbackField = (core::int x) → dynamic {};
-  self::Foo<core::num> fooNum = fooInt;
-  fooNum.method(3);
-  fooNum.method(2.5);
-  fooNum.setter = 3;
-  fooNum.setter = 2.5;
-  fooNum.withCallback((core::num x) → dynamic {});
-  fooNum.mutableField = 3;
-  fooNum.mutableField = 2.5;
-  fooNum.mutableCallbackField(3);
-  fooNum.mutableCallbackField(2.5);
-  fooNum.mutableCallbackField = (core::num x) → dynamic {};
-}