Drop ntp_snippets::kStudyName in chrome://flags

components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/ntp_snippets/remote/remote_suggestions_fetcher.h"
 
 #include <deque>
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 253 matching lines @@
       base::TimeDelta::FromMilliseconds(kTestJsonParsingLatencyMs));
 }
 
 }  // namespace
 
 class RemoteSuggestionsFetcherTestBase : public testing::Test {
  public:
   explicit RemoteSuggestionsFetcherTestBase(const GURL& gurl)
       : default_variation_params_(
             {{"send_top_languages", "true"}, {"send_user_class", "true"}}),
-        params_manager_(ntp_snippets::kStudyName,
+        params_manager_(ntp_snippets::kArticleSuggestionsFeature.name,
                         default_variation_params_,
                         {ntp_snippets::kArticleSuggestionsFeature.name}),
         mock_task_runner_(new base::TestMockTimeTaskRunner()),
         mock_task_runner_handle_(mock_task_runner_),
         test_url_(gurl) {
     UserClassifier::RegisterProfilePrefs(utils_.pref_service()->registry());
     user_classifier_ = base::MakeUnique<UserClassifier>(
         utils_.pref_service(), base::MakeUnique<base::DefaultClock>());
     // Increase initial time such that ticks are non-zero.
     mock_task_runner_->FastForwardBy(base::TimeDelta::FromMilliseconds(1234));
@@ skipping 66 matching lines @@
     fake_url_fetcher_factory_.reset(new net::FakeURLFetcherFactory(
         /*default_factory=*/&failing_url_fetcher_factory_));
   }
 
   void SetVariationParam(std::string param_name, std::string value) {
     std::map<std::string, std::string> params = default_variation_params_;
     params[param_name] = value;
 
     params_manager_.ClearAllVariationParams();
     params_manager_.SetVariationParamsWithFeatureAssociations(
-        ntp_snippets::kStudyName, params,
+        ntp_snippets::kArticleSuggestionsFeature.name, params,
         {ntp_snippets::kArticleSuggestionsFeature.name});
   }
 
   void SetFakeResponse(const std::string& response_data,
                        net::HttpStatusCode response_code,
                        net::URLRequestStatus::Status status) {
     InitFakeURLFetcherFactory();
     fake_url_fetcher_factory_->SetFakeResponse(test_url_, response_data,
                                                response_code, status);
   }
@@ skipping 619 matching lines @@
         fetched_categories) {
   if (fetched_categories) {
     // Matchers above aren't any more precise than this, so this is sufficient
     // for test-failure diagnostics.
     return os << "list with " << fetched_categories->size() << " elements";
   }
   return os << "null";
 }
 
 }  // namespace ntp_snippets