Remove the stale test for discarding notifications.

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 43b11d659bcdd4672d5853f104a3e86478fbf60e..ea7db860e9b36d0f072d21bd6305451eeb4d6196 100644
--- a/pkg/analysis_server/test/analysis/update_content_test.dart
+++ b/pkg/analysis_server/test/analysis/update_content_test.dart
@@ -50,26 +50,6 @@ class UpdateContentTest extends AbstractAnalysisTest {
     }
   }
 
-  test_discardNotifications_onSourceChange() async {
-    createProject();
-    addTestFile('');
-    await server.onAnalysisComplete;
-    server.setAnalysisSubscriptions({
-      AnalysisService.NAVIGATION: [testFile].toSet()
-    });
-    // update file, analyze, but don't sent notifications
-    navigationCount = 0;
-    server.updateContent('1', {testFile: new AddContentOverlay('foo() {}')});
-    expect(serverErrorCount, 0);
-    expect(navigationCount, 0);
-    // replace the file contents,
-    // should discard any pending notification operations
-    server.updateContent('2', {testFile: new AddContentOverlay('bar() {}')});
-    await server.onAnalysisComplete;
-    expect(serverErrorCount, 0);
-    expect(navigationCount, 1);
-  }
-
   test_illegal_ChangeContentOverlay() {
     // It should be illegal to send a ChangeContentOverlay for a file that
     // doesn't have an overlay yet.