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

chrome/common/metrics/variations/variations_util.h

 // Copyright (c) 2012 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 CHROME_COMMON_METRICS_VARIATIONS_VARIATIONS_UTIL_H_
 #define CHROME_COMMON_METRICS_VARIATIONS_VARIATIONS_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 13 matching lines @@
 // unique string representations of ActiveGroupIds for each Field Trial that
 // has a chosen group. The strings are formatted as "<TrialName>-<GroupName>",
 // with the names as hex strings. Field Trials for which a group has not been
 // chosen yet are NOT returned in this list.
 void GetFieldTrialActiveGroupIdsAsStrings(std::vector<std::string>* output);
 
 // Get the current set of chosen FieldTrial groups (aka variations) and send
 // them to the child process logging module so it can save it for crash dumps.
 void SetChildProcessLoggingVariationList();
 
-// 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.
-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.
-string16 CombineExperimentLabels(const string16& variation_labels,
-                                 const 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.
-string16 ExtractNonVariationLabels(const string16& labels);
-
 // Expose some functions for testing. These functions just wrap functionality
 // that is implemented above.
 namespace testing {
 
 // Clears all of the mapped associations.
 void ClearAllVariationIDs();
 
 void TestGetFieldTrialActiveGroupIds(
     const base::FieldTrial::ActiveGroups& active_groups,
     std::vector<ActiveGroupId>* name_group_ids);
 
 }  // namespace testing
 
 }  // namespace chrome_variations
 
 #endif  // CHROME_COMMON_METRICS_VARIATIONS_VARIATIONS_UTIL_H_