Replace NULL with nullptr in all C++ files.

webrtc/p2p/base/stunrequest.cc

Index: webrtc/p2p/base/stunrequest.cc
diff --git a/webrtc/p2p/base/stunrequest.cc b/webrtc/p2p/base/stunrequest.cc
index ef2bee8aa819c251f7920df001666867912dc9dc..f0ad0ca7d633f40e7b411bb0844237d74aef7169 100644
--- a/webrtc/p2p/base/stunrequest.cc
+++ b/webrtc/p2p/base/stunrequest.cc
@@ -62,9 +62,9 @@ void StunRequestManager::SendDelayed(StunRequest* request, int delay) {
   request->Construct();
   requests_[request->id()] = request;
   if (delay > 0) {
-    thread_->PostDelayed(RTC_FROM_HERE, delay, request, MSG_STUN_SEND, NULL);
+    thread_->PostDelayed(RTC_FROM_HERE, delay, request, MSG_STUN_SEND, nullptr);
   } else {
-    thread_->Send(RTC_FROM_HERE, request, MSG_STUN_SEND, NULL);
+    thread_->Send(RTC_FROM_HERE, request, MSG_STUN_SEND, nullptr);
   }
 }
 
@@ -73,7 +73,7 @@ void StunRequestManager::Flush(int msg_type) {
     StunRequest* request = kv.second;
     if (msg_type == kAllRequests || msg_type == request->type()) {
       thread_->Clear(request, MSG_STUN_SEND);
-      thread_->Send(RTC_FROM_HERE, request, MSG_STUN_SEND, NULL);
+      thread_->Send(RTC_FROM_HERE, request, MSG_STUN_SEND, nullptr);
     }
   }
 }
@@ -178,7 +178,7 @@ StunRequest::StunRequest(StunMessage* request)
 }
 
 StunRequest::~StunRequest() {
-  RTC_DCHECK(manager_ != NULL);
+  RTC_DCHECK(manager_ != nullptr);
   if (manager_) {
     manager_->Remove(this);
     manager_->thread_->Clear(this);
@@ -198,7 +198,7 @@ void StunRequest::Construct() {
 }
 
 int StunRequest::type() {
-  RTC_DCHECK(msg_ != NULL);
+  RTC_DCHECK(msg_ != nullptr);
   return msg_->type();
 }
 
@@ -217,7 +217,7 @@ void StunRequest::set_manager(StunRequestManager* manager) {
 }
 
 void StunRequest::OnMessage(rtc::Message* pmsg) {
-  RTC_DCHECK(manager_ != NULL);
+  RTC_DCHECK(manager_ != nullptr);
   RTC_DCHECK(pmsg->message_id == MSG_STUN_SEND);
 
   if (timeout_) {
@@ -234,7 +234,7 @@ void StunRequest::OnMessage(rtc::Message* pmsg) {
 
   OnSent();
   manager_->thread_->PostDelayed(RTC_FROM_HERE, resend_delay(), this,
-                                 MSG_STUN_SEND, NULL);
+                                 MSG_STUN_SEND, nullptr);
 }
 
 void StunRequest::OnSent() {