Fix build break in --checked mode.

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 "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "platform/utils.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
@@ skipping 3910 matching lines @@
       "      Expect.equals(true, invocation.isSetter);\n"
       "      Expect.equals(false, invocation.isMethod);\n"
       "      Expect.equals(false, invocation.isGetter);\n"
       "    } else if (name == 'method') {\n"
       "      Expect.equals(true, invocation.isMethod);\n"
       "      Expect.equals(false, invocation.isSetter);\n"
       "      Expect.equals(false, invocation.isGetter);\n"
       "    }\n"
       "    TestClass.fld1 += 1;\n"
       "  }\n"
-      "  static void testMain() {\n"
+      "  static TestClass testMain() {\n"
       "    return new TestClass();\n"
       "  }\n"
       "}\n";
   Dart_Handle result;
   Dart_Handle instance;
   // Create a test library and Load up a test script in it.
   Dart_Handle lib = TestCase::LoadTestScript(kScriptChars, NULL);
   Dart_Handle cls = Dart_GetClass(lib, NewString("TestClass"));
   EXPECT_VALID(cls);
 
@@ skipping 3735 matching lines @@
                                    NewString("main"),
                                    0,
                                    NULL);
   int64_t value = 0;
   result = Dart_IntegerToInt64(result, &value);
   EXPECT_VALID(result);
   EXPECT_EQ(260, value);
 }
 
 }  // namespace dart