Make CriticalSectionWrapper non-virtual

webrtc/system_wrappers/source/condition_variable_event_win.cc

Index: webrtc/system_wrappers/source/condition_variable_event_win.cc
diff --git a/webrtc/system_wrappers/source/condition_variable_event_win.cc b/webrtc/system_wrappers/source/condition_variable_event_win.cc
index 41b019dad3aa02092391503ed0f8724af414afd6..f61e085384ffa19f300d2a7c79b3f91adb6de2f4 100644
--- a/webrtc/system_wrappers/source/condition_variable_event_win.cc
+++ b/webrtc/system_wrappers/source/condition_variable_event_win.cc
@@ -84,7 +84,8 @@ Vanderbilt University to appear in their names.
  */
 
 #include "webrtc/system_wrappers/source/condition_variable_event_win.h"
-#include "webrtc/system_wrappers/source/critical_section_win.h"
+
+#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 
 namespace webrtc {
 
@@ -133,9 +134,7 @@ bool ConditionVariableEventWin::SleepCS(CriticalSectionWrapper& crit_sect,
   ++(num_waiters_[eventID]);
   LeaveCriticalSection(&num_waiters_crit_sect_);
 
-  CriticalSectionWindows* cs =
-      static_cast<CriticalSectionWindows*>(&crit_sect);
-  LeaveCriticalSection(&cs->crit);
+  LeaveCriticalSection(&crit_sect.crit_);
   HANDLE events[2];
   events[0] = events_[WAKE];
   events[1] = events_[eventID];
@@ -161,7 +160,7 @@ bool ConditionVariableEventWin::SleepCS(CriticalSectionWrapper& crit_sect,
     ResetEvent(events_[eventID]);
   }
 
-  EnterCriticalSection(&cs->crit);
+  EnterCriticalSection(&crit_sect.crit_);
   return ret_val;
 }