Deleted OS_WIN and all Windows specific files from base.

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.
 //
 // It also defines a set of simple functions and utilities that people want
 // when using Callback<> and Bind().
@@ skipping 211 matching lines @@
 // See http://crbug.com/82038.
 template <typename T>
 class SupportsAddRefAndRelease {
   typedef char Yes[1];
   typedef char No[2];
 
   struct BaseMixin {
     void AddRef();
   };
 
-// MSVC warns when you try to use Base if T has a private destructor, the
-// common pattern for refcounted types. It does this even though no attempt to
-// instantiate Base is made.  We disable the warning for this definition.
-#if defined(OS_WIN)
-#pragma warning(push)
-#pragma warning(disable:4624)
-#endif
   struct Base : public T, public BaseMixin {
   };
-#if defined(OS_WIN)
-#pragma warning(pop)
-#endif
 
   template <void(BaseMixin::*)(void)> struct Helper {};
 
   template <typename C>
   static No& Check(Helper<&C::AddRef>*);
 
   template <typename >
   static Yes& Check(...);
 
  public:
@@ skipping 339 matching lines @@
 BASE_EXPORT void DoNothing();
 
 template<typename T>
 void DeletePointer(T* obj) {
   delete obj;
 }
 
 }  // namespace base
 
 #endif  // BASE_BIND_HELPERS_H_