Drop ntp_snippets::kStudyName in chrome://flags

components/ntp_snippets/category_rankers/click_based_category_ranker_unittest.cc

Index: components/ntp_snippets/category_rankers/click_based_category_ranker_unittest.cc
diff --git a/components/ntp_snippets/category_rankers/click_based_category_ranker_unittest.cc b/components/ntp_snippets/category_rankers/click_based_category_ranker_unittest.cc
index 172789bfa105d27359f569c7a30f2a2032921ff2..da07fc437f278ac931b99e22f5974bc0470c7f9d 100644
--- a/components/ntp_snippets/category_rankers/click_based_category_ranker_unittest.cc
+++ b/components/ntp_snippets/category_rankers/click_based_category_ranker_unittest.cc
@@ -84,7 +84,7 @@ class ClickBasedCategoryRankerTest : public testing::Test {
 
   void SetDismissedCategoryPenaltyVariationParam(int value) {
     variation_params_manager_.SetVariationParamsWithFeatureAssociations(
-        ntp_snippets::kStudyName,
+        kCategoryRanker.name,
         {{"click_based_category_ranker-dismissed_category_penalty",
           base::IntToString(value)}},
         {kCategoryRanker.name});
@@ -92,7 +92,7 @@ class ClickBasedCategoryRankerTest : public testing::Test {
 
   void SetPromotedCategoryVariationParam(int value) {
     variation_params_manager_.SetVariationParamsWithFeatureAssociations(
-        ntp_snippets::kStudyName,
+        kCategoryRanker.name,
         {{"click_based_category_ranker-promoted_category",
           base::IntToString(value)}},
         {kCategoryRanker.name});