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

chrome/common/variations/fieldtrial_testing_config_schema.json

Index: chrome/common/variations/fieldtrial_testing_config_schema.json
diff --git a/chrome/common/variations/fieldtrial_testing_config_schema.json b/chrome/common/variations/fieldtrial_testing_config_schema.json
index 1b7c43c4592c295a753a40597b79ca218411d5ec..c78e6ac0046f2bb844252df087a3538adc530d0f 100644
--- a/chrome/common/variations/fieldtrial_testing_config_schema.json
+++ b/chrome/common/variations/fieldtrial_testing_config_schema.json
@@ -5,18 +5,18 @@
 {
   "type_name": "FieldTrialTestingConfig",
   "schema": [{
-    "field": "trials",
+    "field": "studies",
     "type": "array",
     "contents": {
-      "type_name": "FieldTrialTestingTrial",
+      "type_name": "FieldTrialTestingStudy",
       "type": "struct",
       "fields": [
         {"field": "name", "type": "string"},
         {
-          "field": "groups",
+          "field": "experiments",
           "type": "array",
           "contents": {
-            "type_name": "FieldTrialTestingGroup",
+            "type_name": "FieldTrialTestingExperiment",
             "type": "struct",
             "fields": [
               {"field": "name", "type": "string"},
@@ -24,7 +24,7 @@
                 "field": "params",
                 "type": "array",
                 "contents": {
-                  "type_name": "FieldTrialTestingGroupParams",
+                  "type_name": "FieldTrialTestingExperimentParams",
                   "type": "struct",
                   "fields": [
                     {"field": "key", "type": "string"},