Use Study and Experiment Terminology on the C++ Side For Fieldtrials

tools/variations/unittest_data/expected_output.h

Index: tools/variations/unittest_data/expected_output.h
diff --git a/tools/variations/unittest_data/expected_output.h b/tools/variations/unittest_data/expected_output.h
index 86b44f0a418f285d53adcee8491ae365d7786332..a36e68d8839574164d1f623f8721705305c0935c 100644
--- a/tools/variations/unittest_data/expected_output.h
+++ b/tools/variations/unittest_data/expected_output.h
@@ -13,14 +13,14 @@
 #include <cstddef>
 
 
-struct FieldTrialTestingGroupParams {
+struct FieldTrialTestingExperimentParams {
   const char* const key;
   const char* const value;
 };
 
-struct FieldTrialTestingGroup {
+struct FieldTrialTestingExperiment {
   const char* const name;
-  const FieldTrialTestingGroupParams * params;
+  const FieldTrialTestingExperimentParams * params;
   const size_t params_size;
   const char* const * enable_features;
   const size_t enable_features_size;
@@ -28,15 +28,15 @@ struct FieldTrialTestingGroup {
   const size_t disable_features_size;
 };
 
-struct FieldTrialTestingTrial {
+struct FieldTrialTestingStudy {
   const char* const name;
-  const FieldTrialTestingGroup * groups;
-  const size_t groups_size;
+  const FieldTrialTestingExperiment * experiments;
+  const size_t experiments_size;
 };
 
 struct FieldTrialTestingConfig {
-  const FieldTrialTestingTrial * trials;
-  const size_t trials_size;
+  const FieldTrialTestingStudy * studies;
+  const size_t studies_size;
 };