Add support for base::Closure in the MessageLoop.

base/bind_internal_win.h

Index: base/bind_internal_win.h
diff --git a/base/bind_internal_win.h b/base/bind_internal_win.h
index dab8d51717b7bb15f496f77f3f6495159d9e363b..ca6feeb825cd3a1e3183fbe9fb8cbd47d6e387ba 100644
--- a/base/bind_internal_win.h
+++ b/base/bind_internal_win.h
@@ -3,6 +3,7 @@
 // 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.
@@ -14,6 +15,11 @@
 #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 {
 
@@ -125,4 +131,6 @@ struct FunctionTraits<R(__fastcall *)(X1, X2, X3, X4, X5, X6)> {
 }  // namespace internal
 }  // namespace base
 
+#endif  // !defined(ARCH_CPU_X86_64)
+
 #endif  // BASE_BIND_INTERNAL_WIN_H_