Send 'analysis.flushResults' on file removal.

pkg/analysis_server/test/context_manager_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.context.directory.manager;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/error/error.dart';
@@ skipping 2503 matching lines @@
       sources.remove(source);
     }
     for (Source source in changeSet.changedSources) {
       expect(filePaths, contains(source.fullName));
       filePaths[source.fullName] = now;
     }
 
     currentContext.applyChanges(changeSet);
   }
 
+  @override
+  void applyFileRemoved(AnalysisDriver driver, String file) {
+    throw new StateError('Unexpected invocation of applyFileRemoved');
+  }
+
   void assertContextFiles(String contextPath, List<String> expectedFiles) {
     var actualFiles = currentContextFilePaths[contextPath].keys;
     expect(actualFiles, unorderedEquals(expectedFiles));
   }
 
   void assertContextPaths(List<String> expected) {
     expect(currentContextPaths, unorderedEquals(expected));
   }
 
   @override
@@ skipping 56 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }