GCAPI should append to the existing experiment_labels instead of clobbering them.

chrome/browser/metrics/variations/variations_registry_syncer_win.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 "chrome/browser/metrics/variations/variations_registry_syncer_win.h"
 
 #include "base/files/file_path.h"
 #include "base/metrics/field_trial.h"
 #include "base/path_service.h"
 #include "base/strings/string16.h"
-#include "chrome/common/metrics/variations/variations_util.h"
+#include "chrome/common/metrics/variations/experiment_labels_win.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "chrome/installer/util/install_util.h"
 
 namespace {
 
 // Delay before performing a registry sync, in seconds.
 const int kRegistrySyncDelaySeconds = 5;
 
 }  // namespace
 
@@ skipping 52 matching lines @@
       CombineExperimentLabels(variation_labels, other_labels);
 
   if (!GoogleUpdateSettings::SetExperimentLabels(is_system_install,
                                                  combined_labels)) {
     DVLOG(1) << "Error writing Variation labels to the registry: "
              << combined_labels;
   }
 }
 
 }  // namespace chrome_variations