Plug memory leak in Isolate.

src/v8threads.h

Index: src/v8threads.h
diff --git a/src/v8threads.h b/src/v8threads.h
index a2aee4e3383c5519891f3302d9b96afbd94c7cbb..8dce8602f66488668e94274ccf0a628fc5e2d9a0 100644
--- a/src/v8threads.h
+++ b/src/v8threads.h
@@ -1,4 +1,4 @@
-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2012 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:
@@ -57,6 +57,7 @@ class ThreadState {
 
  private:
   explicit ThreadState(ThreadManager* thread_manager);
+  ~ThreadState();
 
   void AllocateSpace();
 
@@ -114,6 +115,8 @@ class ThreadManager {
   ThreadManager();
   ~ThreadManager();
 
+  void DeleteThreadStateList(ThreadState* anchor);
+
   void EagerlyArchiveThread();
 
   Mutex* mutex_;