Replace AllowCrossThreadAccess() + non-GCed pointers with crossThreadUnretained()

third_party/WebKit/Source/core/dom/CrossThreadTask.h

 /*
  * Copyright (C) 2009-2010 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 62 matching lines @@
 //     ptr->member(p1, ..., pn);
 //
 // ExecutionContext:
 //     |context| is supplied by the target thread.
 //
 // Deep copies by threadSafeBind():
 //     |ptr|, |p1|, ..., |pn| are processed by threadSafeBind() and thus
 //     CrossThreadCopier.
 //     You don't have to call manually e.g. isolatedCopy().
 //     To pass things that cannot be copied by CrossThreadCopier
-//     (e.g. pointers), use AllowCrossThreadAccess() explicitly.
+//     (e.g. pointers), use crossThreadUnretained() explicitly.
 
 // RETTYPE, PS, and MPS are added as template parameters to circumvent MSVC 18.00.21005.1 (VS 2013) issues.
 
 template<typename FunctionType, typename... P,
     typename RETTYPE = std::unique_ptr<ExecutionContextTask>, size_t PS = sizeof...(P), size_t MPS = WTF::FunctionWrapper<FunctionType>::numberOfArguments>
 typename std::enable_if<PS + 1 == MPS, RETTYPE>::type createCrossThreadTask(FunctionType function, P&&... parameters)
 {
     return internal::createCallClosureTask(threadSafeBind(function, std::forward<P>(parameters)...));
 }
 
 template<typename FunctionType, typename... P,
     typename RETTYPE = std::unique_ptr<ExecutionContextTask>, size_t PS = sizeof...(P), size_t MPS = WTF::FunctionWrapper<FunctionType>::numberOfArguments>
 typename std::enable_if<PS == MPS, RETTYPE>::type createCrossThreadTask(FunctionType function, P&&... parameters)
 {
     return internal::createCallClosureTask(threadSafeBind(function, std::forward<P>(parameters)...));
 }
 
 } // namespace blink
 
 #endif // CrossThreadTask_h