Add other variations (with ids) for NTPSnippets to chrome://flags

components/variations/variations_http_header_provider.cc

Index: components/variations/variations_http_header_provider.cc
diff --git a/components/variations/variations_http_header_provider.cc b/components/variations/variations_http_header_provider.cc
index d77a4bf8e3d024de175152d6e74580b836cb47e0..412f8d24359e12f094632c5dea151b514d571029 100644
--- a/components/variations/variations_http_header_provider.cc
+++ b/components/variations/variations_http_header_provider.cc
@@ -57,11 +57,10 @@ std::string VariationsHttpHeaderProvider::GetVariationsString() {
 }
 
 bool VariationsHttpHeaderProvider::SetDefaultVariationIds(
-    const std::string& variation_ids) {
+    const std::vector<std::string>& variation_ids) {
   default_variation_ids_set_.clear();
   default_trigger_id_set_.clear();
-  for (const base::StringPiece& entry : base::SplitStringPiece(
-           variation_ids, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
+  for (const std::string& entry : variation_ids) {
     if (entry.empty()) {
       default_variation_ids_set_.clear();
       default_trigger_id_set_.clear();