Enable NTPSuggestionsSectionDismissal by default.

components/ntp_snippets/features.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/features.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "components/variations/variations_associated_data.h"
 
 namespace ntp_snippets {
@@ skipping 13 matching lines @@
 const base::Feature kDownloadSuggestionsFeature{
     "NTPDownloadSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kPhysicalWebPageSuggestionsFeature{
     "NTPPhysicalWebPageSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kContentSuggestionsFeature{
     "NTPSnippets", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kSectionDismissalFeature{
-    "NTPSuggestionsSectionDismissal", base::FEATURE_DISABLED_BY_DEFAULT};
+    "NTPSuggestionsSectionDismissal", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kForeignSessionsSuggestionsFeature{
     "NTPForeignSessionsSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 int GetParamAsInt(const base::Feature& feature,
                   const std::string& param_name,
                   const int default_value) {
   std::string value_as_string =
       variations::GetVariationParamValueByFeature(feature, param_name);
   int value_as_int = 0;
   if (!base::StringToInt(value_as_string, &value_as_int)) {
     if (!value_as_string.empty()) {
       LOG(WARNING) << "Failed to parse variation param " << param_name
                    << " with string value " << value_as_string
                    << " under feature " << feature.name
                    << " into an int. Falling back to default value of "
                    << default_value;
     }
     value_as_int = default_value;
   }
   return value_as_int;
 }
 
 }  // namespace ntp_snippets