Tweak for make test passing with useTaskModel = true.

pkg/analysis_server/test/analysis/update_content_test.dart

Index: pkg/analysis_server/test/analysis/update_content_test.dart
diff --git a/pkg/analysis_server/test/analysis/update_content_test.dart b/pkg/analysis_server/test/analysis/update_content_test.dart
index 656e06a7a808812fe1bb17d0920c60343f5c759a..6fbc5d8427418c1aae4aaa3c4cf65703acd17b26 100644
--- a/pkg/analysis_server/test/analysis/update_content_test.dart
+++ b/pkg/analysis_server/test/analysis/update_content_test.dart
@@ -107,7 +107,11 @@ class UpdateContentTest extends AbstractAnalysisTest {
     server.updateContent('2', {testFile: new RemoveContentOverlay()});
     // Validate that at the end the unit was indexed.
     await server.onAnalysisComplete;
-    verify(server.index.index(anyObject, testUnitMatcher)).times(2);
+    if (AnalysisEngine.instance.useTaskModel) {
+      verify(server.index.index(anyObject, testUnitMatcher)).times(3);
+    } else {
+      verify(server.index.index(anyObject, testUnitMatcher)).times(2);
+    }
   }
 
   test_multiple_contexts() async {