Add support for base::Closure in the MessageLoop.

base/bind_internal_win.h

 // This file was GENERATED by command:
 //     pump.py bind_internal_win.h.pump
 // DO NOT EDIT BY HAND!!!
 
 
+
 // Copyright (c) 2011 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.
 
 // Specializations of FunctionTraits<> for Windows specific calling
 // conventions.  Please see base/bind_internal.h for more info.
 
 #ifndef BASE_BIND_INTERNAL_WIN_H_
 #define BASE_BIND_INTERNAL_WIN_H_
 #pragma once
 
+// In the x64 architecture in Windows, __fastcall, __stdcall, etc, are all
+// the same as __cdecl which would turn the following specializations into
+// multiple definitions.
+#if !defined(ARCH_CPU_X86_64)
+
 namespace base {
 namespace internal {
 
 template <typename Sig>
 struct FunctionTraits;
 
 // __stdcall Function: Arity 0.
 template <typename R>
 struct FunctionTraits<R(__stdcall *)()> {
   typedef R (*NormalizedSig)();
@@ skipping 91 matching lines @@
 template <typename R, typename X1, typename X2, typename X3, typename X4,
     typename X5, typename X6>
 struct FunctionTraits<R(__fastcall *)(X1, X2, X3, X4, X5, X6)> {
   typedef R (*NormalizedSig)(X1, X2, X3, X4, X5, X6);
   typedef false_type IsMethod;
 };
 
 }  // namespace internal
 }  // namespace base
 
+#endif  // !defined(ARCH_CPU_X86_64)
+
 #endif  // BASE_BIND_INTERNAL_WIN_H_