NTPSnippets: User locale was not set when user isn't signed in.

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 cb7ac2d4c666fd5bda14f87ea8c9bbd4c7b54f5d..026dd4cea0c4abe80820c031bff08e142bbe3599 100644
--- a/components/ntp_snippets/ntp_snippets_fetcher.cc
+++ b/components/ntp_snippets/ntp_snippets_fetcher.cc
@@ -454,6 +454,7 @@ void NTPSnippetsFetcher::FetchSnippetsNonAuthenticated() {
   params.excluded_ids = excluded_ids_;
   params.count_to_fetch = count_to_fetch_;
   params.interactive_request = interactive_request_;
+  params.user_locale = locale_;
   FetchSnippetsImpl(url, std::string(), params.BuildRequest());
 }