Issue 20240. Use a FileManager that manages its own temporary directory.

pkg/analysis_server/lib/src/domain_server.dart

Index: pkg/analysis_server/lib/src/domain_server.dart
diff --git a/pkg/analysis_server/lib/src/domain_server.dart b/pkg/analysis_server/lib/src/domain_server.dart
index cfa75882ee2e229056f85b3915bc7d3637d4c593..446d0532e81f52ebcff358f9eab2397ba856a1a5 100644
--- a/pkg/analysis_server/lib/src/domain_server.dart
+++ b/pkg/analysis_server/lib/src/domain_server.dart
@@ -118,7 +118,7 @@ class ServerDomainHandler implements RequestHandler {
    * Cleanly shutdown the analysis server.
    */
   Response shutdown(Request request) {
-    server.running = false;
+    server.shutdown();
     Response response = new Response(request.id);
     return response;
   }