Fix another handful of memory leaks

src/v8threads.cc

 // Copyright 2008 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 287 matching lines @@
       lazily_archived_thread_(ThreadId::Invalid()),
       lazily_archived_thread_state_(NULL),
       free_anchor_(NULL),
       in_use_anchor_(NULL) {
   free_anchor_ = new ThreadState(this);
   in_use_anchor_ = new ThreadState(this);
 }
 
 
 ThreadManager::~ThreadManager() {
-  // TODO(isolates): Destroy mutexes.
+  delete mutex_;
+  delete free_anchor_;
+  delete in_use_anchor_;
 }
 
 
 void ThreadManager::ArchiveThread() {
   ASSERT(lazily_archived_thread_.Equals(ThreadId::Invalid()));
   ASSERT(!IsArchived());
   ASSERT(IsLockedByCurrentThread());
   ThreadState* state = GetFreeThreadState();
   state->Unlink();
   Isolate::PerIsolateThreadData* per_thread =
@@ skipping 142 matching lines @@
 // Acknowledge the preemption by the receiving thread.
 void ContextSwitcher::PreemptionReceived() {
   ASSERT(Locker::IsLocked());
   // There is currently no accounting being done for this. But could be in the
   // future, which is why we leave this in.
 }
 
 
 }  // namespace internal
 }  // namespace v8