- Pass Dart_Null() instead of an empty array for unused import maps.

bin/gen_snapshot.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.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 256 matching lines @@
 
   ASSERT(snapshot_filename != NULL);
   // Load up the script before a snapshot is created.
   if (app_script_name != NULL) {
     // Load the specified script.
     library = LoadSnapshotCreationScript(app_script_name);
     VerifyLoaded(library);
   } else {
     // Load a dummy script as the script to setup the tag handler.
     Dart_Handle empty_string = Dart_NewString("");
-    Dart_Handle import_map = Dart_NewList(0);
-    Dart_Handle lib = Dart_LoadScript(empty_string,
+    library = Dart_LoadScript(empty_string,
                                       empty_string,
                                       BuiltinLibraryTagHandler,
-                                      import_map);
-    USE(lib);
+                                      Dart_Null());
+    VerifyLoaded(library);
     // This is a generic dart snapshot which needs builtin library setup.
     library = LoadGenericSnapshotCreationScript(Builtin::kBuiltinLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kIOLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kJsonLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kUriLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kUtf8Library);
@@ skipping 12 matching lines @@
     exit(255);
   }
   // Now write the snapshot out to specified file and exit.
   WriteSnapshotFile(buffer, size);
   Dart_ExitScope();
 
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   return 0;
 }