Fix typing in analyzer.

pkg/analysis_server/test/integration/integration_tests.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.integration.analysis;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 197 matching lines @@
    * If [skipShutdown] is not set, shut down the server.
    */
   Future shutdownIfNeeded() {
     if (skipShutdown) {
       return new Future.value();
     }
     // Give the server a short time to comply with the shutdown request; if it
     // doesn't exit, then forcibly terminate it.
     sendServerShutdown();
     return server.exitCode.timeout(SHUTDOWN_TIMEOUT, onTimeout: () {
-      return server.kill('server failed to exit');
+      // The integer value of the exit code isn't used, but we have to return
+      // an integer to keep the typing correct.
+      return server.kill('server failed to exit').then((_) => -1);
     });
   }
 
   /**
    * Convert the given [relativePath] to an absolute path, by interpreting it
    * relative to [sourceDirectory].  On Windows any forward slashes in
    * [relativePath] are converted to backslashes.
    */
   String sourcePath(String relativePath) {
     return join(sourceDirectory.path, relativePath.replaceAll('/', separator));
@@ skipping 751 matching lines @@
   void populateMismatches(item, List<MismatchDescriber> mismatches);
 
   /**
    * Create a [MismatchDescriber] describing a mismatch with a simple string.
    */
   MismatchDescriber simpleDescription(String description) =>
       (Description mismatchDescription) {
         mismatchDescription.add(description);
       };
 }