Remove XP Condition Variable Affordances

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/logging.h"
 #include "base/macros.h"
@@ skipping 43 matching lines @@
     bool rv = lock_.Try();
     if (rv) {
       CheckUnheldAndMark();
     }
     return rv;
   }
 
   void AssertAcquired() const;
 #endif  // DCHECK_IS_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.
+#if defined(OS_POSIX) || defined(OS_WIN)
+  // Both Windows and POSIX implementations of ConditionVariable need to be
+  // able to see our lock and tweak our debugging counters, as they release and
+  // acquire locks inside of their condition variable APIs.
   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 DCHECK_IS_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_