Don't implicitly run "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 10a603390bc7d5bf67236fc540ff9c8e051482ad..4f27b2fb0e2ba95f62c11109d864d6b08c6dd767 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
@@ -15,10 +15,11 @@ main() {
     d.dir(appPath, [
       d.appPubspec()
     ]).create();
+    pubGet();
   });
 
   integration("responds with NOT_SERVED for an unknown domain", () {
-    pubServe(shouldGetFirst: true);
+    pubServe();
     expectWebSocketError("urlToAssetId", {
       "url": "http://example.com:80/index.html"
     }, NOT_SERVED, '"example.com:80" is not being served by pub.');
@@ -26,7 +27,7 @@ main() {
   });
 
   integration("responds with NOT_SERVED for an unknown port", () {
-    pubServe(shouldGetFirst: true);
+    pubServe();
     expectWebSocketError("urlToAssetId", {
       "url": "http://localhost:80/index.html"
     }, NOT_SERVED, '"localhost:80" is not being served by pub.');