(TBR) fix completion test

pkg/analysis_server/test/services/completion/completion_computer_test.dart

Index: pkg/analysis_server/test/services/completion/completion_computer_test.dart
diff --git a/pkg/analysis_server/test/services/completion/completion_computer_test.dart b/pkg/analysis_server/test/services/completion/completion_computer_test.dart
index 21b33932ac6b8e86477987b2fbcf073b69642709..3445f73db80b278e46bb024e895145a91cd6497f 100644
--- a/pkg/analysis_server/test/services/completion/completion_computer_test.dart
+++ b/pkg/analysis_server/test/services/completion/completion_computer_test.dart
@@ -113,7 +113,7 @@ class DartCompletionManagerTest extends AbstractSingleUnitTest {
       // There is only one notification
       expect(count, equals(1));
     });
-    return pumpEventQueue(150).then((_) {
+    return pumpEventQueue(250).then((_) {
       expect(done, isTrue);
     });
   }