Update handling of ambiguous name references

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 5610 matching lines @@
   url = NewString("library2_dart");
   source = NewString(kLibrary2Chars);
   Dart_LoadLibrary(url, source);
 
   url = NewString("library1_dart");
   source = NewString(kLibrary1Chars);
   Dart_LoadLibrary(url, source);
 
   result = Dart_Invoke(result, NewString("main"), 0, NULL);
   EXPECT(Dart_IsError(result));
-  EXPECT_SUBSTRING("ambiguous reference: 'foo'", Dart_GetError(result));
+  EXPECT_SUBSTRING("NoSuchMethodError", Dart_GetError(result));
 }
 
 
 // Test that if the same name is imported from two libraries, it is
 // not an error if that name is not used.
 TEST_CASE(ImportLibrary4) {
   const char* kScriptChars =
       "import 'library2_dart';\n"
       "import 'library1_dart';\n"
       "main() {  }\n";
@@ skipping 1675 matching lines @@
                                    NewString("main"),
                                    0,
                                    NULL);
   int64_t value = 0;
   result = Dart_IntegerToInt64(result, &value);
   EXPECT_VALID(result);
   EXPECT_EQ(8, value);
 }
 
 }  // namespace dart