Fix a bunch of pub tests that started running "pub get".

test/serve/web_socket/url_to_asset_id_errors_test.dart

Index: test/serve/web_socket/url_to_asset_id_errors_test.dart
diff --git a/test/serve/web_socket/url_to_asset_id_errors_test.dart b/test/serve/web_socket/url_to_asset_id_errors_test.dart
index c3cfa91126662631fa7c2f16900ad36c4623c1f5..10a603390bc7d5bf67236fc540ff9c8e051482ad 100644
--- a/test/serve/web_socket/url_to_asset_id_errors_test.dart
+++ b/test/serve/web_socket/url_to_asset_id_errors_test.dart
@@ -18,7 +18,7 @@ main() {
   });
 
   integration("responds with NOT_SERVED for an unknown domain", () {
-    pubServe();
+    pubServe(shouldGetFirst: true);
     expectWebSocketError("urlToAssetId", {
       "url": "http://example.com:80/index.html"
     }, NOT_SERVED, '"example.com:80" is not being served by pub.');
@@ -26,7 +26,7 @@ main() {
   });
 
   integration("responds with NOT_SERVED for an unknown port", () {
-    pubServe();
+    pubServe(shouldGetFirst: true);
     expectWebSocketError("urlToAssetId", {
       "url": "http://localhost:80/index.html"
     }, NOT_SERVED, '"localhost:80" is not being served by pub.');