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 6a925cb04c766d2f235880039f5e594025793cf8..7a8621b8e14460dc95ef81df821d2d6e2ce135d8 100644
--- a/components/ntp_snippets/ntp_snippets_fetcher.cc
+++ b/components/ntp_snippets/ntp_snippets_fetcher.cc
@@ -213,8 +213,8 @@ 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;