Cleanup Semaphore class.

src/marking-thread.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
 #include "spaces.h"
 
 #include "heap.h"
 
 namespace v8 {
 namespace internal {
 
 class MarkingThread : public Thread {
  public:
   explicit MarkingThread(Isolate* isolate);
+  ~MarkingThread() {}
 
   void Run();
   void Stop();
   void StartMarking();
   void WaitForMarkingThread();
 
-  ~MarkingThread() {
-    delete start_marking_semaphore_;
-    delete end_marking_semaphore_;
-    delete stop_semaphore_;
-  }
-
  private:
   Isolate* isolate_;
   Heap* heap_;
-  Semaphore* start_marking_semaphore_;
-  Semaphore* end_marking_semaphore_;
-  Semaphore* stop_semaphore_;
+  Semaphore start_marking_semaphore_;
+  Semaphore end_marking_semaphore_;
+  Semaphore stop_semaphore_;
   volatile AtomicWord stop_thread_;
   int id_;
   static Atomic32 id_counter_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARKING_THREAD_H_