Fix 'Unused local variable' hints in analyzer and analysis_server.

pkg/analysis_server/test/timing/timing_framework.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.timing;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:math';
 
@@ skipping 187 matching lines @@
 
   /**
    * Shut the server down unless [skipShutdown] is `true`.
    */
   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.
-    Completer processExited = new Completer();
     sendServerShutdown();
     return server.exitCode.timeout(SHUTDOWN_TIMEOUT, onTimeout: () {
       return server.kill();
     });
   }
 }
 
 /**
  * Instances of the class [TimingResult] represent the timing information
  * gathered while executing a given timing test.
@@ skipping 92 matching lines @@
    */
   List<int> toMilliseconds(List<int> times) {
     int count = times.length;
     List<int> convertedValues = new List<int>();
     for (int i = 0; i < count; i++) {
       convertedValues.add(times[i] ~/ NANOSECONDS_PER_MILLISECOND);
     }
     return convertedValues;
   }
 }