Remove a test that is incredibly flaky on some platforms.

tests/language/async_star_test.dart

 // Copyright (c) 2015, 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 async_start_test;
 
 import "package:unittest/unittest.dart";
 import "dart:async";
 
 main() {
@@ skipping 686 matching lines @@
           done.complete();
         }
       }, onDone: () {
         fail("Unexpected done!");
       });
       return done.future.whenComplete(() {
         expect(list.length == 18 || list.length == 19, isTrue);
       });
     });
 
-    test("multiple pauses, cancel while paused", () {
-      var list = [];
-      f() async* {
-        int i = 0;
-        while (true) {
-          yield i;
-          list.add(i);
-          i++;
-          await null;  // extra pause for good measure.
-        }
-      }
-      int expected = 0;
-      var done = new Completer();
-      var sub;
-      sub = f().listen((v) {
-        expect(v, equals(expected++));
-        if (v == 5) {
-          scheduleMicrotask(() {
-            sub.pause();
-            sub.resume();
-            sub.pause();
-            sub.resume();
-            sub.pause();
-            sub.resume();
-          });
-        } else if (v == 6) {
-          sub.pause();
-          new Timer(MS * 300, () {
-            expect(list.length, lessThan(8));
-            sub.cancel();
-            done.complete();
-          });
-        }
-      }, onDone: () {
-        fail("Unexpected done");
-      });
-    });
-
     test("canceling while paused at yield", () {                  /// 02: ok
       var list = [];                                              /// 02: continued
       var sync = new Sync();                                      /// 02: continued
       f() async* {                                                /// 02: continued
         list.add("*1");                                           /// 02: continued
         yield 1;                                                  /// 02: continued
         await sync.wait();                                        /// 02: continued
         sync.release();                                           /// 02: continued
         list.add("*2");                                           /// 02: continued
         yield 2;                                                  /// 02: continued
@@ skipping 196 matching lines @@
   }
 
   // Release whoever is currently waiting.
   void release([v]) {
     if (_completer != null) {
       _completer.complete(v);
       _completer = null;
     }
   }
 }