Check in codegen test expectations.

test/codegen/expect/language/constructor10_test_none_multi.js

+dart_library.library('language/constructor10_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__constructor10_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const constructor10_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  constructor10_test_none_multi.A = class A extends core.Object {
+    new(x) {
+      this.x = x;
+    }
+  };
+  dart.setSignature(constructor10_test_none_multi.A, {
+    constructors: () => ({new: dart.definiteFunctionType(constructor10_test_none_multi.A, [dart.dynamic])})
+  });
+  constructor10_test_none_multi.B = class B extends constructor10_test_none_multi.A {
+    new() {
+      super.new(null);
+    }
+  };
+  dart.setSignature(constructor10_test_none_multi.B, {
+    constructors: () => ({new: dart.definiteFunctionType(constructor10_test_none_multi.B, [])})
+  });
+  constructor10_test_none_multi.Y = class Y extends constructor10_test_none_multi.A {
+    new() {
+      super.new(null);
+    }
+  };
+  dart.setSignature(constructor10_test_none_multi.Y, {
+    constructors: () => ({new: dart.definiteFunctionType(constructor10_test_none_multi.Y, [])})
+  });
+  constructor10_test_none_multi.Z = class Z extends constructor10_test_none_multi.Y {
+    new() {
+      super.new();
+    }
+  };
+  dart.setSignature(constructor10_test_none_multi.Z, {
+    constructors: () => ({new: dart.definiteFunctionType(constructor10_test_none_multi.Z, [])})
+  });
+  constructor10_test_none_multi.G = class G extends constructor10_test_none_multi.A {
+    new() {
+      super.new(null);
+    }
+  };
+  dart.setSignature(constructor10_test_none_multi.G, {
+    constructors: () => ({new: dart.definiteFunctionType(constructor10_test_none_multi.G, [])})
+  });
+  constructor10_test_none_multi.H = class H extends constructor10_test_none_multi.G {
+    new() {
+      super.new();
+    }
+  };
+  constructor10_test_none_multi.main = function() {
+    new constructor10_test_none_multi.B().x;
+    new constructor10_test_none_multi.Z().x;
+    new constructor10_test_none_multi.H().x;
+  };
+  dart.fn(constructor10_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.constructor10_test_none_multi = constructor10_test_none_multi;
+});