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

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

Index: test/unittests/libplatform/default-platform-unittest.cc
diff --git a/test/unittests/libplatform/default-platform-unittest.cc b/test/unittests/libplatform/default-platform-unittest.cc
index ffa3199444eb4457017921bf9e622bf0a1c8ce70..814b27bc518e5a147e0291e605ccae416539c4c5 100644
--- a/test/unittests/libplatform/default-platform-unittest.cc
+++ b/test/unittests/libplatform/default-platform-unittest.cc
@@ -111,5 +111,21 @@ TEST(DefaultPlatformTest, PumpMessageLoopNoStarvation) {
   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