Deleted OS_WIN and all Windows specific files from base.

base/win/enum_variant.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.
-
-#ifndef BASE_WIN_ENUM_VARIANT_H_
-#define BASE_WIN_ENUM_VARIANT_H_
-
-#include <unknwn.h>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/win/iunknown_impl.h"
-
-namespace base {
-namespace win {
-
-// A simple implementation of IEnumVARIANT.
-class BASE_EXPORT EnumVariant
-  : public IEnumVARIANT,
-    public IUnknownImpl {
- public:
-  // The constructor allocates an array of size |count|. Then use
-  // ItemAt to set the value of each item in the array to initialize it.
-  explicit EnumVariant(unsigned long count);
-
-  // Returns a mutable pointer to the item at position |index|.
-  VARIANT* ItemAt(unsigned long index);
-
-  // IUnknown.
-  ULONG STDMETHODCALLTYPE AddRef() override;
-  ULONG STDMETHODCALLTYPE Release() override;
-  STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override;
-
-  // IEnumVARIANT.
-  STDMETHODIMP Next(ULONG requested_count,
-                    VARIANT* out_elements,
-                    ULONG* out_elements_received) override;
-  STDMETHODIMP Skip(ULONG skip_count) override;
-  STDMETHODIMP Reset() override;
-  STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object) override;
-
- private:
-  ~EnumVariant() override;
-
-  scoped_ptr<VARIANT[]> items_;
-  unsigned long count_;
-  unsigned long current_index_;
-};
-
-}  // namespace win
-}  // namespace base
-
-#endif  // BASE_WIN_ENUM_VARIANT_H_