Fix build break.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 797 matching lines @@
   return Api::NewHandle(isolate, ApiError::New(message));
 }
 
 
 DART_EXPORT Dart_Handle Dart_NewUnhandledExceptionError(Dart_Handle exception) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   CHECK_CALLBACK_STATE(isolate);
 
   Instance& obj = Instance::Handle(isolate);
-  if (Dart_IsApiError(exception) || Dart_IsCompilationError(exception)) {
+  intptr_t class_id = Api::ClassId(exception);
+  if ((class_id == kApiErrorCid) || (class_id == kLanguageErrorCid)) {
     obj = String::New(Dart_GetError(exception));
   } else {
     obj = Api::UnwrapInstanceHandle(isolate, exception).raw();
     if (obj.IsNull()) {
       RETURN_TYPE_ERROR(isolate, exception, Instance);
     }
   }
   const Stacktrace& stacktrace = Stacktrace::Handle(isolate);
   return Api::NewHandle(isolate, UnhandledException::New(obj, stacktrace));
 }
@@ skipping 4957 matching lines @@
   ASSERT(stream != NULL);
   TimelineEvent* event = stream->StartEvent();
   if (event != NULL) {
     event->AsyncEnd(label, async_id);
     event->Complete();
   }
   return Api::Success();
 }
 
 }  // namespace dart