Update expectations for closure conversion tests

pkg/kernel/testcases/closures/instance_tear_off.dart.expect

 library;
 import self as self;
 import "dart:core" as core;
 
 class C extends core::Object {
-  field dynamic f = MakeClosure<() → dynamic>(self::closure#C#f#function, null);
+  field dynamic f = MakeClosure<() → core::String>(self::closure#C#f#function, null);
   constructor •() → void
     : super core::Object::•()
     ;
   get g() → dynamic {
-    return MakeClosure<(dynamic) → dynamic>(self::closure#C#g#function, null);
+    return MakeClosure<(dynamic) → core::String>(self::closure#C#g#function, null);
   }
   method a() → dynamic {
     return "a";
   }
   method b(dynamic x) → dynamic {
     return x;
   }
   method c(dynamic x, [dynamic y = 2]) → dynamic {
     return x.+(y);
   }
@@ skipping 15 matching lines @@
     #context[1] = this;
     return MakeClosure<(dynamic, [dynamic]) → dynamic>(self::closure#C#c, #context);
   }
   method d#get() → dynamic {
     final Vector #context = MakeVector(2);
     #context[1] = this;
     return MakeClosure<(dynamic, {y: dynamic}) → dynamic>(self::closure#C#d, #context);
   }
 }
 class D<T extends core::Object> extends core::Object {
-  field dynamic f = MakeClosure<() → dynamic>(self::closure#D#f#function, null);
+  field dynamic f = MakeClosure<() → core::String>(self::closure#D#f#function, null);
   constructor •() → void
     : super core::Object::•()
     ;
   get g() → dynamic {
-    return MakeClosure<(dynamic) → dynamic>(self::closure#D#g#function, null);
+    return MakeClosure<(dynamic) → core::String>(self::closure#D#g#function, null);
   }
   method a() → dynamic {
     return "a";
   }
   method b(dynamic x) → dynamic {
     return x;
   }
   method c(dynamic x, [dynamic y = 2]) → dynamic {
     return x.+(y);
   }
@@ skipping 15 matching lines @@
     #context[1] = this;
     return MakeClosure<(dynamic, [dynamic]) → dynamic>(self::closure#D#c, #context);
   }
   method d#get() → dynamic {
     final Vector #context = MakeVector(2);
     #context[1] = this;
     return MakeClosure<(dynamic, {y: dynamic}) → dynamic>(self::closure#D#d, #context);
   }
 }
 class E<T extends core::Object> extends core::Object {
-  field dynamic f = MakeClosure<() → dynamic>(self::closure#E#f#function, null);
+  field dynamic f = MakeClosure<() → core::String>(self::closure#E#f#function, null);
   constructor •() → void
     : super core::Object::•()
     ;
   get g() → dynamic {
-    return MakeClosure<(dynamic) → dynamic>(self::closure#E#g#function, null);
+    return MakeClosure<(dynamic) → core::String>(self::closure#E#g#function, null);
   }
   method a() → dynamic {
     return "a";
   }
   method b(self::E::T x) → dynamic {
     return x;
   }
   method c(self::E::T x, [self::E::T y = 2]) → dynamic {
     return x.+(y);
   }
@@ skipping 44 matching lines @@
   self::expect(42, o.d(40));
   self::expect(42, o.d#get().call(40));
   self::expect(87, o.d(80, y: 7));
   self::expect(87, o.d#get().call(80, y: 7));
 }
 static method main(dynamic arguments) → dynamic {
   self::test(new self::C::•());
   self::test(new self::D::•<core::int>());
   self::test(new self::E::•<core::int>());
 }
-static method closure#C#g#function(Vector #contextParameter, dynamic x) → dynamic {
+static method closure#C#g#function(Vector #contextParameter, dynamic x) → core::String {
   return "g(${x})";
 }
 static method closure#C#a(Vector #contextParameter) → dynamic
   return (#contextParameter[1]).{self::C::a}();
 static method closure#C#b(Vector #contextParameter, dynamic x) → dynamic
   return (#contextParameter[1]).{self::C::b}(x);
 static method closure#C#c(Vector #contextParameter, dynamic x, [dynamic y = 2]) → dynamic
   return (#contextParameter[1]).{self::C::c}(x, y);
 static method closure#C#d(Vector #contextParameter, dynamic x, {dynamic y = 2}) → dynamic
   return (#contextParameter[1]).{self::C::d}(x, y: y);
-static method closure#C#f#function(Vector #contextParameter) → dynamic {
+static method closure#C#f#function(Vector #contextParameter) → core::String {
   return "f";
 }
-static method closure#D#g#function(Vector #contextParameter, dynamic x) → dynamic {
+static method closure#D#g#function(Vector #contextParameter, dynamic x) → core::String {
   return "g(${x})";
 }
 static method closure#D#a(Vector #contextParameter) → dynamic
   return (#contextParameter[1]).{self::D::a}();
 static method closure#D#b(Vector #contextParameter, dynamic x) → dynamic
   return (#contextParameter[1]).{self::D::b}(x);
 static method closure#D#c(Vector #contextParameter, dynamic x, [dynamic y = 2]) → dynamic
   return (#contextParameter[1]).{self::D::c}(x, y);
 static method closure#D#d(Vector #contextParameter, dynamic x, {dynamic y = 2}) → dynamic
   return (#contextParameter[1]).{self::D::d}(x, y: y);
-static method closure#D#f#function(Vector #contextParameter) → dynamic {
+static method closure#D#f#function(Vector #contextParameter) → core::String {
   return "f";
 }
-static method closure#E#g#function(Vector #contextParameter, dynamic x) → dynamic {
+static method closure#E#g#function(Vector #contextParameter, dynamic x) → core::String {
   return "g(${x})";
 }
 static method closure#E#a(Vector #contextParameter) → dynamic
   return (#contextParameter[1]).{self::E::a}();
 static method closure#E#b(Vector #contextParameter, dynamic x) → dynamic
   return (#contextParameter[1]).{self::E::b}(x);
 static method closure#E#c(Vector #contextParameter, dynamic x, [dynamic y = 2]) → dynamic
   return (#contextParameter[1]).{self::E::c}(x, y);
 static method closure#E#d(Vector #contextParameter, dynamic x, {dynamic y = 2}) → dynamic
   return (#contextParameter[1]).{self::E::d}(x, y: y);
-static method closure#E#f#function(Vector #contextParameter) → dynamic {
+static method closure#E#f#function(Vector #contextParameter) → core::String {
   return "f";
 }