[ DartDev ] Fix create_integration_test.dart

Failures started appearing after package:build_runner was updated to
2.5.0 and changed some log messages tests were relying on.

Change-Id: I3c3c4ee173b48de94d8e1342003ca4f3d839c891
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/434842
Commit-Queue: Ben Konyi <[email protected]>
Reviewed-by: Morgan :) <[email protected]>
Commit-Queue: Morgan :) <[email protected]>
Auto-Submit: Ben Konyi <[email protected]>

Author: bkonyi

pkg/dartdev/test/commands/create_integration_test.dart

@@ -133,7 +133,7 @@ void defineCreateTests() {
             print('stdout: $e');
             if (e.contains('[SEVERE]') ||
                 (isServerTemplate && e.contains('Server listening on port')) ||
-                (isWebTemplate && e.contains('Succeeded after'))) {
+                (isWebTemplate && e.contains('Built with build_runner'))) {
               if (e.contains('[SEVERE]')) {
                 hasError = true;
               }