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

src/libplatform/default-platform.cc

Index: src/libplatform/default-platform.cc
diff --git a/src/libplatform/default-platform.cc b/src/libplatform/default-platform.cc
index 2885d55de7066c19546cee6a82587ffa3b050ad9..2e13cc09042a896a62aec3525890f8d72a22eb3d 100644
--- a/src/libplatform/default-platform.cc
+++ b/src/libplatform/default-platform.cc
@@ -41,19 +41,24 @@ DefaultPlatform::~DefaultPlatform() {
   base::LockGuard<base::Mutex> guard(&lock_);
   queue_.Terminate();
   if (initialized_) {
-    for (std::vector<WorkerThread*>::iterator i = thread_pool_.begin();
-         i != thread_pool_.end(); ++i) {
+    for (auto i = thread_pool_.begin(); i != thread_pool_.end(); ++i) {
       delete *i;
     }
   }
-  for (std::map<v8::Isolate*, std::queue<Task*> >::iterator i =
-           main_thread_queue_.begin();
-       i != main_thread_queue_.end(); ++i) {
+  for (auto i = main_thread_queue_.begin(); i != main_thread_queue_.end();
+       ++i) {
     while (!i->second.empty()) {
       delete i->second.front();
       i->second.pop();
     }
   }
+  for (auto i = main_thread_delayed_queue_.begin();
+       i != main_thread_delayed_queue_.end(); ++i) {
+    while (!i->second.empty()) {
+      delete i->second.top().second;
+      i->second.pop();
+    }
+  }
 }