Add support for base::Closure in the MessageLoop.

base/bind_helpers.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.
 
 // This defines a set of argument wrappers and related factory methods that
 // can be used specify the refcounting and reference semantics of arguments
 // that are bound by the Bind() function in base/bind.h.
 //
 // The public functions are base::Unretained() and base::ConstRef().
 // Unretained() allows Bind() to bind a non-refcounted class.
@@ skipping 127 matching lines @@
 // instantiate Base is made.  We disable the warning for this definition.
 #if defined(OS_WIN)
 #pragma warning(disable:4624)
 #endif
   struct Base : public T, public BaseMixin {
   };
 #if defined(OS_WIN)
 #pragma warning(default:4624)
 #endif
 
-  template <void(BaseMixin::*)(void)>  struct Helper {};
+  template <void(BaseMixin::*)(void)> struct Helper {};
 
   template <typename C>
   static No& Check(Helper<&C::AddRef>*, Helper<&C::Release>*);
 
   template <typename >
   static Yes& Check(...);
 
  public:
   static const bool value = sizeof(Check<Base>(0,0)) == sizeof(Yes);
 };
@@ skipping 95 matching lines @@
 }
 
 template <typename T>
 inline internal::ConstRefWrapper<T> ConstRef(const T& o) {
   return internal::ConstRefWrapper<T>(o);
 }
 
 }  // namespace base
 
 #endif  // BASE_BIND_HELPERS_H_