Fix Windows build error

runtime/vm/snapshot_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_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_message.h"
@@ skipping 1521 matching lines @@
 
   object.type = Dart_CObject::kArray;
   object.value.as_array.length = 0;
   EXPECT(Dart_PostCObject(send_port_id, &object));
 
   static const int kArrayLength = 10;
   Dart_CObject* array =
       reinterpret_cast<Dart_CObject*>(
           Dart_ScopeAllocate(
               sizeof(Dart_CObject) + sizeof(Dart_CObject*) * kArrayLength));  // NOLINT
-  array->type = Dart_CObject::Dart_CObject::kArray;
+  array->type = Dart_CObject::kArray;
   array->value.as_array.length = kArrayLength;
   array->value.as_array.values =
       reinterpret_cast<Dart_CObject**>(array + 1);
   for (int i = 0; i < kArrayLength; i++) {
     Dart_CObject* element =
         reinterpret_cast<Dart_CObject*>(
             Dart_ScopeAllocate(sizeof(Dart_CObject)));
     element->type = Dart_CObject::kInt32;
     element->value.as_int32 = i;
     array->value.as_array.values[i] = element;
   }
   EXPECT(Dart_PostCObject(send_port_id, array));
 
   result = Dart_RunLoop();
   EXPECT(Dart_IsError(result));
   EXPECT(Dart_ErrorHasException(result));
   EXPECT_SUBSTRING("Exception: nulltruefalse1234563.14[]100123456789\n",
                    Dart_GetError(result));
 
   Dart_ExitScope();
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart