Implement updated method overriding rules in the vm.

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
@@ skipping 5284 matching lines @@
 }
 
 
 TEST_CASE(ParsePatchLibrary) {
   const char* kLibraryChars =
   "library patched_library;\n"
   "class A {\n"
   "  final fvalue;\n"
   "  var _f;\n"
   "  callFunc(x, y) => x(y);\n"
-  "  external method(var value);\n"
+  "  external void method(var value);\n"
   "  get field => _field;\n"
   "}\n"
   "class B {\n"
   "  var val;\n"
   "  external B.named(x);\n"
   "  external B(v);\n"
   "}\n"
   "external int unpatched();\n"
   "external int topLevel(var value);\n"
   "external int get topLevelGetter;\n"
   "external void set topLevelSetter(int value);\n";
 
   const char* kPatchChars =
   "patch class A {\n"
   "  var _g;\n"
   "  A() : fvalue = 13;\n"
   "  get _field => _g;\n"
-  "  patch method(var value) {\n"
+  "  /*patch*/ void method(var value) {\n"
   "    int closeYourEyes(var eggs) { return eggs * -1; }\n"
   "    value = callFunc(closeYourEyes, value);\n"
   "    _g = value * 5;\n"
   "  }\n"
   "}\n"
   "patch class B {\n"
   "  B._internal(x) : val = x;\n"
   "  /*patch*/ factory B.named(x) { return new B._internal(x); }\n"
   "  /*patch*/ factory B(v) native \"const_B_factory\";\n"
   "}\n"
@@ skipping 1918 matching lines @@
                                    NewString("main"),
                                    0,
                                    NULL);
   int64_t value = 0;
   result = Dart_IntegerToInt64(result, &value);
   EXPECT_VALID(result);
   EXPECT_EQ(8, value);
 }
 
 }  // namespace dart