[Variations] Refactor all state used for study filtering into a container struct.

components/variations/variations_seed_simulator.cc

Index: components/variations/variations_seed_simulator.cc
diff --git a/components/variations/variations_seed_simulator.cc b/components/variations/variations_seed_simulator.cc
index 59b56643adf1d94a8d78d82963a9ec923a30d583..05f5f73ebd24db653f173e997222935abcb27af4 100644
--- a/components/variations/variations_seed_simulator.cc
+++ b/components/variations/variations_seed_simulator.cc
@@ -9,6 +9,7 @@
 #include <map>
 
 #include "base/metrics/field_trial.h"
+#include "components/variations/client_filterable_state.h"
 #include "components/variations/processed_study.h"
 #include "components/variations/proto/study.pb.h"
 #include "components/variations/study_filtering.h"
@@ -114,19 +115,9 @@ VariationsSeedSimulator::~VariationsSeedSimulator() {
 
 VariationsSeedSimulator::Result VariationsSeedSimulator::SimulateSeedStudies(
     const VariationsSeed& seed,
-    const std::string& locale,
-    const base::Time& reference_date,
-    const base::Version& version,
-    Study_Channel channel,
-    Study_FormFactor form_factor,
-    const std::string& hardware_class,
-    const std::string& session_consistency_country,
-    const std::string& permanent_consistency_country) {
+    const ClientFilterableState& client_state) {
   std::vector<ProcessedStudy> filtered_studies;
-  FilterAndValidateStudies(seed, locale, reference_date, version, channel,
-                           form_factor, hardware_class,
-                           session_consistency_country,
-                           permanent_consistency_country, &filtered_studies);
+  FilterAndValidateStudies(seed, client_state, &filtered_studies);
 
   return ComputeDifferences(filtered_studies);
 }