Convert resources to take an instance key instead of an Instance*.

ppapi/utility/threading/simple_thread.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/utility/threading/simple_thread.h"
 
 #ifdef WIN32
 #include <windows.h>
 #endif
 
@@ skipping 20 matching lines @@
     data->func(data->message_loop, data->user_data);
   else
     data->message_loop.Run();
 
   delete data;
   return NULL;
 }
 
 }   // namespace
 
-SimpleThread::SimpleThread(Instance* instance)
+SimpleThread::SimpleThread(const InstanceHandle& instance)
     : instance_(instance),
       message_loop_(instance),
       thread_(0) {
 }
 
 SimpleThread::~SimpleThread() {
   Join();
 }
 
 bool SimpleThread::Start() {
@@ skipping 35 matching lines @@
 #else
   if (pthread_create(&thread_, NULL, &RunThread, data) != 0) {
 #endif
     delete data;
     return false;
   }
   return true;
 }
 
 }  // namespace pp