Removing Variations support for google_update_experiment_id.

components/variations/experiment_labels.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_VARIATIONS_EXPERIMENT_LABELS_H_
 #define COMPONENTS_VARIATIONS_EXPERIMENT_LABELS_H_
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string16.h"
 
 namespace variations {
 
-// Takes the list of active groups and builds the label for the ones that have
-// Google Update VariationID associated with them. This will return an empty
-// string if there are no such groups.
-base::string16 BuildGoogleUpdateExperimentLabel(
-    const base::FieldTrial::ActiveGroups& active_groups);
-
-// Creates a final combined experiment labels string with |variation_labels|
-// and |other_labels|, appropriately appending a separator based on their
-// contents. It is assumed that |variation_labels| and |other_labels| do not
-// have leading or trailing separators.
-base::string16 CombineExperimentLabels(const base::string16& variation_labels,
-                                       const base::string16& other_labels);
-
 // Takes the value of experiment_labels from the registry and returns a valid
 // experiment_labels string value containing only the labels that are not
 // associated with Chrome Variations.
 base::string16 ExtractNonVariationLabels(const base::string16& labels);
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_EXPERIMENT_LABELS_H_