Deleted OS_WIN and all Windows specific files from base.

base/win/iunknown_impl.cc

-// 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.
-
-#include "base/win/iunknown_impl.h"
-
-namespace base {
-namespace win {
-
-IUnknownImpl::IUnknownImpl()
-    : ref_count_(0) {
-}
-
-IUnknownImpl::~IUnknownImpl() {
-}
-
-ULONG STDMETHODCALLTYPE IUnknownImpl::AddRef() {
-  base::AtomicRefCountInc(&ref_count_);
-  return 1;
-}
-
-ULONG STDMETHODCALLTYPE IUnknownImpl::Release() {
-  if (!base::AtomicRefCountDec(&ref_count_)) {
-    delete this;
-    return 0;
-  }
-  return 1;
-}
-
-STDMETHODIMP IUnknownImpl::QueryInterface(REFIID riid, void** ppv) {
-  if (riid == IID_IUnknown) {
-    *ppv = static_cast<IUnknown*>(this);
-    AddRef();
-    return S_OK;
-  }
-
-  *ppv = NULL;
-  return E_NOINTERFACE;
-}
-
-}  // namespace win
-}  // namespace base