Remove XP Condition Variable Affordances

base/synchronization/condition_variable.h

Index: base/synchronization/condition_variable.h
diff --git a/base/synchronization/condition_variable.h b/base/synchronization/condition_variable.h
index a41b2ba5a7815e692ae44bc5a704925793b28c27..7dda21ffce848e9af49b4c31b6303d08bfbf56fd 100644
--- a/base/synchronization/condition_variable.h
+++ b/base/synchronization/condition_variable.h
@@ -75,9 +75,12 @@
 #include <pthread.h>
 #endif
 
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
 namespace base {
 
-class ConditionVarImpl;
 class TimeDelta;
 
 class BASE_EXPORT ConditionVariable {
@@ -100,14 +103,15 @@ class BASE_EXPORT ConditionVariable {
  private:
 
 #if defined(OS_WIN)
-  ConditionVarImpl* impl_;
+  CONDITION_VARIABLE cv_;
+  CRITICAL_SECTION* const crit_sec_;
 #elif defined(OS_POSIX)
   pthread_cond_t condition_;
   pthread_mutex_t* user_mutex_;
-#if DCHECK_IS_ON()
-  base::Lock* user_lock_;     // Needed to adjust shadow lock state on wait.
 #endif
 
+#if DCHECK_IS_ON() && (defined(OS_WIN) || defined(OS_POSIX))
+  base::Lock* const user_lock_;  // Needed to adjust shadow lock state on wait.
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ConditionVariable);