Pass bound values as const values to the bound function

base/bind_internal_win.h

 // 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 RunnableAdapter<> 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_
 
@@ skipping 18 matching lines @@
  public:
   // MSVC 2013 doesn't support Type Alias of function types.
   // Revisit this after we update it to newer version.
   typedef R RunType(Args...);
 
   explicit RunnableAdapter(R(__stdcall *function)(Args...))
       : function_(function) {
   }
 
   template <typename... RunArgs>
-  R Run(RunArgs&&... args) {
+  R Run(RunArgs&&... args) const {
     return function_(std::forward<RunArgs>(args)...);
   }
 
  private:
   R (__stdcall *function_)(Args...);
 };
 
 // __fastcall Function.
 template <typename R, typename... Args>
 class RunnableAdapter<R(__fastcall *)(Args...)> {
  public:
   // MSVC 2013 doesn't support Type Alias of function types.
   // Revisit this after we update it to newer version.
   typedef R RunType(Args...);
 
   explicit RunnableAdapter(R(__fastcall *function)(Args...))
       : function_(function) {
   }
 
   template <typename... RunArgs>
-  R Run(RunArgs&&... args) {
+  R Run(RunArgs&&... args) const {
     return function_(std::forward<RunArgs>(args)...);
   }
 
  private:
   R (__fastcall *function_)(Args...);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // !defined(ARCH_CPU_X86_64)
 
 #endif  // BASE_BIND_INTERNAL_WIN_H_