Fix group datadeps

tools/gn/ninja_group_target_writer.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/ninja_group_target_writer.h"
 
 #include "base/strings/string_util.h"
 #include "tools/gn/output_file.h"
 #include "tools/gn/string_utils.h"
 #include "tools/gn/target.h"
@@ skipping 10 matching lines @@
   // A group rule just generates a stamp file with dependencies on each of
   // the deps and datadeps in the group.
   std::vector<OutputFile> output_files;
   const LabelTargetVector& deps = target_->deps();
   for (size_t i = 0; i < deps.size(); i++)
     output_files.push_back(deps[i].ptr->dependency_output_file());
 
   std::vector<OutputFile> data_output_files;
   const LabelTargetVector& datadeps = target_->datadeps();
   for (size_t i = 0; i < datadeps.size(); i++)
-    data_output_files.push_back(deps[i].ptr->dependency_output_file());
+    data_output_files.push_back(datadeps[i].ptr->dependency_output_file());
 
   WriteStampForTarget(output_files, data_output_files);
 }