Simplify ownership of a ThreadState's interruptors.

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 121 matching lines @@
 }
 
 ThreadState::~ThreadState()
 {
     ASSERT(checkThread());
     delete m_threadLocalWeakCallbackStack;
     m_threadLocalWeakCallbackStack = nullptr;
     for (int i = 0; i < NumberOfHeaps; ++i)
         delete m_heaps[i];
 
-    for (Interruptor* interruptor : m_interruptors)
-        delete interruptor;
-
     **s_threadSpecific = nullptr;
     if (isMainThread()) {
         s_mainThreadStackStart = 0;
         s_mainThreadUnderestimatedStackSize = 0;
     }
 }
 
 void ThreadState::init()
 {
     s_threadSpecific = new WTF::ThreadSpecific<ThreadState*>();
@@ skipping 1121 matching lines @@
     ASSERT(slotCount < 1024);
 #endif
 
     ASSERT(!m_safePointStackCopy.size());
     m_safePointStackCopy.resize(slotCount);
     for (size_t i = 0; i < slotCount; ++i) {
         m_safePointStackCopy[i] = from[i];
     }
 }
 
-void ThreadState::addInterruptor(Interruptor* interruptor)
+void ThreadState::addInterruptor(PassOwnPtr<Interruptor> interruptor)
 {
     ASSERT(checkThread());
     SafePointScope scope(HeapPointersOnStack);
     {
         MutexLocker locker(threadAttachMutex());
         m_interruptors.append(interruptor);
     }
 }
 
 void ThreadState::removeInterruptor(Interruptor* interruptor)
@@ skipping 235 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink