Update golden files.

pkg/front_end/testcases/inference/infer_assign_to_implicit_this.dart.direct.expect

 library test;
 import self as self;
 import "dart:core" as core;
 
 class A extends core::Object {
   constructor •() → void
     : super core::Object::•()
     ;
 }
 class B extends self::A {
@@ skipping 13 matching lines @@
   constructor •() → void
     : super self::B::•()
     ;
 }
 class Test extends core::Object {
   field self::B member = null;
   constructor •() → void
     : super core::Object::•()
     ;
   method test() → void {
-    this.member = self::f();
-    this.member.==(null) ? this.member = self::f() : null;
-    this.member = this.member.+(self::f());
-    this.member = this.member.*(self::f());
-    this.member = this.member.&(self::f());
+    this.member = self::f<dynamic>();
+    this.member.==(null) ? this.member = self::f<dynamic>() : null;
+    this.member = this.member.+(self::f<dynamic>());
+    this.member = this.member.*(self::f<dynamic>());
+    this.member = this.member.&(self::f<dynamic>());
     this.member = this.member.-(1);
     this.member = this.member.-(1);
-    dynamic v1 = this.member = self::f();
-    dynamic v2 = let final dynamic #t1 = this.member in #t1.==(null) ? this.member = self::f() : #t1;
-    dynamic v3 = this.member = this.member.+(self::f());
-    dynamic v4 = this.member = this.member.*(self::f());
-    dynamic v5 = this.member = this.member.&(self::f());
+    dynamic v1 = this.member = self::f<dynamic>();
+    dynamic v2 = let final dynamic #t1 = this.member in #t1.==(null) ? this.member = self::f<dynamic>() : #t1;
+    dynamic v3 = this.member = this.member.+(self::f<dynamic>());
+    dynamic v4 = this.member = this.member.*(self::f<dynamic>());
+    dynamic v5 = this.member = this.member.&(self::f<dynamic>());
     dynamic v6 = this.member = this.member.-(1);
     dynamic v7 = let final dynamic #t2 = this.member in let final dynamic #t3 = this.member = #t2.-(1) in #t2;
   }
 }
-static method f() → dynamic
+static method f<T extends core::Object>() → self::f::T
   return null;
 static method main() → dynamic {}