Send 'analysis.flushResults' on file removal.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index da64893198bca5d79093b7da48382b7c8232339e..cff64d0dcf1a201cb84be2a40652f9cd2631ec28 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -1910,6 +1910,12 @@ class ServerContextManagerCallbacks extends ContextManagerCallbacks {
   }
 
   @override
+  void applyFileRemoved(nd.AnalysisDriver driver, String file) {
+    driver.removeFile(file);
+    sendAnalysisNotificationFlushResults(analysisServer, [file]);
+  }
+
+  @override
   void computingPackageMap(bool computing) =>
       analysisServer._computingPackageMap(computing);