- Make sure that externals are patched for dart2js.

runtime/bin/main.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 <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 746 matching lines @@
     CHECK_RESULT(result);
 
     // Run event-loop and wait for script loading to complete.
     result = Dart_RunLoop();
     CHECK_RESULT(result);
 
     if (isolate_data->load_async_id >= 0) {
       Dart_TimelineAsyncEnd("LoadScript", isolate_data->load_async_id);
     }
 
-    Platform::SetPackageRoot(package_root);
-
     result = DartUtils::SetupIOLibrary(script_uri);
     CHECK_RESULT(result);
   }
 
   // Make the isolate runnable so that it is ready to handle messages.
   Dart_ExitScope();
   Dart_ExitIsolate();
   bool retval = Dart_IsolateMakeRunnable(isolate);
   if (!retval) {
     *error = strdup("Invalid isolate state - Unable to make it runnable");
@@ skipping 714 matching lines @@
   Platform::Exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }