Deleted OS_WIN and all Windows specific files from base.

base/synchronization/condition_variable.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.
 
 // ConditionVariable wraps pthreads condition variable synchronization or, on
 // Windows, simulates it.  This functionality is very helpful for having
 // several threads wait for an event, as is common with a thread pool managed
 // by a master.  The meaning of such an event in the (worker) thread pool
 // scenario is that additional tasks are now available for processing.  It is
 // used in Chrome in the DNS prefetching system to notify worker threads that
@@ skipping 81 matching lines @@
   void Wait();
   void TimedWait(const TimeDelta& max_time);
 
   // Broadcast() revives all waiting threads.
   void Broadcast();
   // Signal() revives one waiting thread.
   void Signal();
 
  private:
 
-#if defined(OS_WIN)
-  ConditionVarImpl* impl_;
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
   pthread_cond_t condition_;
   pthread_mutex_t* user_mutex_;
 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
   base::Lock* user_lock_;     // Needed to adjust shadow lock state on wait.
 #endif
 
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ConditionVariable);
 };
 
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_CONDITION_VARIABLE_H_