Add request throttler to thumbnail fetching for articles on mobile NTP

components/ntp_snippets/ntp_snippets_fetcher.cc

Index: components/ntp_snippets/ntp_snippets_fetcher.cc
diff --git a/components/ntp_snippets/ntp_snippets_fetcher.cc b/components/ntp_snippets/ntp_snippets_fetcher.cc
index 4f595e76848d41045f606143d2d1278dd16be6f5..40ca2551a8fca522a8a9f1e036056d179c690c45 100644
--- a/components/ntp_snippets/ntp_snippets_fetcher.cc
+++ b/components/ntp_snippets/ntp_snippets_fetcher.cc
@@ -212,8 +212,8 @@ void NTPSnippetsFetcher::FetchSnippetsFromHosts(
     const std::set<std::string>& hosts,
     const std::string& language_code,
     int count,
-    bool force_request) {
-  if (!request_throttler_.DemandQuotaForRequest(force_request))
+    bool interactive_request) {
+  if (!request_throttler_.DemandQuotaForRequest(interactive_request))
     return;
 
   hosts_ = hosts;