ntp_snippets: default to staging API on dev/canary

components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc

Index: components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc
diff --git a/components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc b/components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc
index a75bcfe0a4bdb6e52fdcfcf5e5c24ebd72178b82..0f62c6c83c8548103db7b61d0d57f62d321179be 100644
--- a/components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc
+++ b/components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc
@@ -302,7 +302,9 @@ class RemoteSuggestionsFetcherTestBase : public testing::Test {
     fetcher_ = base::MakeUnique<RemoteSuggestionsFetcher>(
         utils_.fake_signin_manager(), fake_token_service_.get(),
         std::move(request_context_getter), utils_.pref_service(), nullptr,
-        base::Bind(&ParseJsonDelayed), kAPIKey, user_classifier_.get());
+        base::Bind(&ParseJsonDelayed),
+        GetFetchEndpoint(/*is_stable_or_beta_channel=*/true), kAPIKey,
+        user_classifier_.get());
 
     fetcher_->SetClockForTesting(mock_task_runner_->GetMockClock());
   }