Fix memory-leak in default platform implementation of delayed tasks.

test/unittests/libplatform/default-platform-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/libplatform/default-platform.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using testing::InSequence;
 using testing::StrictMock;
 
@@ skipping 93 matching lines @@
   platform.CallOnForegroundThread(isolate, task3);
 
   EXPECT_CALL(*task2, Run());
   EXPECT_CALL(*task2, Die());
   EXPECT_TRUE(platform.PumpMessageLoop(isolate));
   EXPECT_CALL(*task3, Run());
   EXPECT_CALL(*task3, Die());
   EXPECT_TRUE(platform.PumpMessageLoop(isolate));
 }
 
+
+TEST(DefaultPlatformTest, PendingDelayedTasksAreDestroyedOnShutdown) {
+  InSequence s;
+
+  int dummy;
+  Isolate* isolate = reinterpret_cast<Isolate*>(&dummy);
+
+  {
+    DefaultPlatformWithMockTime platform;
+    StrictMock<MockTask>* task = new StrictMock<MockTask>;
+    platform.CallDelayedOnForegroundThread(isolate, task, 10);
+    EXPECT_CALL(*task, Die());
+  }
+}
+
+
 }  // namespace platform
 }  // namespace v8