Deleted OS_WIN and all Windows specific files from base.

base/synchronization/lock_impl.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_SYNCHRONIZATION_LOCK_IMPL_H_
 #define BASE_SYNCHRONIZATION_LOCK_IMPL_H_
 
 #include "build/build_config.h"
 
-#if defined(OS_WIN)
-#include <windows.h>
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
 #include <pthread.h>
 #endif
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 
 namespace base {
 namespace internal {
 
 // This class implements the underlying platform-specific spin-lock mechanism
 // used for the Lock class.  Most users should not use LockImpl directly, but
 // should instead use Lock.
 class BASE_EXPORT LockImpl {
  public:
-#if defined(OS_WIN)
-  typedef CRITICAL_SECTION NativeHandle;
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
   typedef pthread_mutex_t NativeHandle;
 #endif
 
   LockImpl();
   ~LockImpl();
 
   // If the lock is not held, take it and return true.  If the lock is already
   // held by something else, immediately return false.
   bool Try();
 
@@ skipping 12 matching lines @@
  private:
   NativeHandle native_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(LockImpl);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_LOCK_IMPL_H_