Fixes that host restriction was sometimes applied even when switched off.

components/ntp_snippets/ntp_snippets_service.cc

Index: components/ntp_snippets/ntp_snippets_service.cc
diff --git a/components/ntp_snippets/ntp_snippets_service.cc b/components/ntp_snippets/ntp_snippets_service.cc
index 02524508ceca77bf9620436e54bc6604c47ab25e..589a77772989ac62adddaccf66b641814c92dc84 100644
--- a/components/ntp_snippets/ntp_snippets_service.cc
+++ b/components/ntp_snippets/ntp_snippets_service.cc
@@ -186,7 +186,7 @@ void NTPSnippetsService::Init(bool enabled) {
   enabled_ = enabled;
   if (enabled_) {
     // |suggestions_service_| can be null in tests.
-    if (suggestions_service_) {
+    if (snippets_fetcher_->UseHostRestriction() && suggestions_service_) {
       suggestions_service_subscription_ = suggestions_service_->AddCallback(
           base::Bind(&NTPSnippetsService::OnSuggestionsChanged,
                      base::Unretained(this)));