Replace NULL with nullptr in all C++ files.

webrtc/system_wrappers/source/condition_variable_event_win.cc

 /*
 Source:
 http://www1.cse.wustl.edu/~schmidt/ACE-copying.html
 
 License:
 Copyright and Licensing Information for ACE(TM), TAO(TM), CIAO(TM), DAnCE(TM),
 and CoSMIC(TM)
 
 ACE(TM), TAO(TM), CIAO(TM), DAnCE>(TM), and CoSMIC(TM) (henceforth referred to
 as "DOC software") are copyrighted by Douglas C. Schmidt and his research
@@ skipping 76 matching lines @@
 
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 
 namespace webrtc {
 
 ConditionVariableEventWin::ConditionVariableEventWin() : eventID_(WAKEALL_0) {
   memset(&num_waiters_[0], 0, sizeof(num_waiters_));
 
   InitializeCriticalSection(&num_waiters_crit_sect_);
 
-  events_[WAKEALL_0] = CreateEvent(NULL,  // no security attributes
-                                   TRUE,  // manual-reset, sticky event
-                                   FALSE,  // initial state non-signaled
-                                   NULL);  // no name for event
+  events_[WAKEALL_0] = CreateEvent(nullptr,   // no security attributes
+                                   TRUE,      // manual-reset, sticky event
+                                   FALSE,     // initial state non-signaled
+                                   nullptr);  // no name for event
 
-  events_[WAKEALL_1] = CreateEvent(NULL,  // no security attributes
-                                   TRUE,  // manual-reset, sticky event
-                                   FALSE,  // initial state non-signaled
-                                   NULL);  // no name for event
+  events_[WAKEALL_1] = CreateEvent(nullptr,   // no security attributes
+                                   TRUE,      // manual-reset, sticky event
+                                   FALSE,     // initial state non-signaled
+                                   nullptr);  // no name for event
 
-  events_[WAKE] = CreateEvent(NULL,  // no security attributes
-                              FALSE,  // auto-reset, sticky event
-                              FALSE,  // initial state non-signaled
-                              NULL);  // no name for event
+  events_[WAKE] = CreateEvent(nullptr,   // no security attributes
+                              FALSE,     // auto-reset, sticky event
+                              FALSE,     // initial state non-signaled
+                              nullptr);  // no name for event
 }
 
 ConditionVariableEventWin::~ConditionVariableEventWin() {
   CloseHandle(events_[WAKE]);
   CloseHandle(events_[WAKEALL_1]);
   CloseHandle(events_[WAKEALL_0]);
 
   DeleteCriticalSection(&num_waiters_crit_sect_);
 }
 
@@ skipping 64 matching lines @@
   const EventWakeUpType eventID = eventID_;
   const bool have_waiters = num_waiters_[eventID] > 0;
   LeaveCriticalSection(&num_waiters_crit_sect_);
 
   if (have_waiters) {
     SetEvent(events_[eventID]);
   }
 }
 
 }  // namespace webrtc