Rename all of experiments_helper to variations_helper, including files, namespaces, and various fun…

chrome/browser/metrics/metrics_log.h

Index: chrome/browser/metrics/metrics_log.h
===================================================================
--- chrome/browser/metrics/metrics_log.h	(revision 151037)
+++ chrome/browser/metrics/metrics_log.h	(working copy)
@@ -28,7 +28,7 @@
 struct ProcessDataSnapshot;
 }
 
-namespace experiments_helper {
+namespace chrome_variations {
 struct SelectedGroupId;
 }
 
@@ -132,7 +132,7 @@
   // Fills |field_trial_ids| with the list of initialized field trials name and
   // group ids.
   virtual void GetFieldTrialIds(
-    std::vector<experiments_helper::SelectedGroupId>* field_trial_ids) const;
+    std::vector<chrome_variations::SelectedGroupId>* field_trial_ids) const;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(MetricsLogTest, ChromeOSStabilityData);