ntp_snippets: default to staging API on dev/canary

components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc

Index: components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc
diff --git a/components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc b/components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc
index 84349c862695b8acc838a367cc09420ede36a22a..be206ec5a74a1f5d6d7d3073bcde526f65e9528b 100644
--- a/components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc
+++ b/components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc
@@ -414,7 +414,9 @@ class RemoteSuggestionsProviderImplTest : public ::testing::Test {
     auto suggestions_fetcher = base::MakeUnique<RemoteSuggestionsFetcher>(
         utils_.fake_signin_manager(), /*token_service=*/nullptr,
         std::move(request_context_getter), utils_.pref_service(), nullptr,
-        base::Bind(&ParseJson), kAPIKey, &user_classifier_);
+        base::Bind(&ParseJson),
+        GetFetchEndpoint(/*is_stable_or_beta_channel=*/true), kAPIKey,
+        &user_classifier_);
     suggestions_fetcher_ = suggestions_fetcher.get();
 
     auto image_fetcher = base::MakeUnique<NiceMock<MockImageFetcher>>();