Deleted OS_WIN and all Windows specific files from base.

base/synchronization/lock.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_H_
 #define BASE_SYNCHRONIZATION_LOCK_H_
 
 #include "base/base_export.h"
 #include "base/synchronization/lock_impl.h"
 #include "base/threading/platform_thread.h"
@@ skipping 45 matching lines @@
   }
 
   void AssertAcquired() const;
 #endif  // NDEBUG && !DCHECK_ALWAYS_ON
 
 #if defined(OS_POSIX)
   // The posix implementation of ConditionVariable needs to be able
   // to see our lock and tweak our debugging counters, as it releases
   // and acquires locks inside of pthread_cond_{timed,}wait.
   friend class ConditionVariable;
-#elif defined(OS_WIN)
-  // The Windows Vista implementation of ConditionVariable needs the
-  // native handle of the critical section.
-  friend class WinVistaCondVar;
 #endif
 
  private:
 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
   // Members and routines taking care of locks assertions.
   // Note that this checks for recursive locks and allows them
   // if the variable is set.  This is allowed by the underlying implementation
   // on windows but not on Posix, so we're doing unneeded checks on Posix.
   // It's worth it to share the code.
   void CheckHeldAndUnmark();
@@ skipping 48 matching lines @@
   }
 
  private:
   Lock& lock_;
   DISALLOW_COPY_AND_ASSIGN(AutoUnlock);
 };
 
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_LOCK_H_