Replace NULL with nullptr in all C++ files.

webrtc/pc/test/peerconnectiontestwrapper.cc

Index: webrtc/pc/test/peerconnectiontestwrapper.cc
diff --git a/webrtc/pc/test/peerconnectiontestwrapper.cc b/webrtc/pc/test/peerconnectiontestwrapper.cc
index c4336996528ae2fcbb3d45ea931d3774e1b061ca..26259b9528f2c2225108882ccfc3ed57ad765aa9 100644
--- a/webrtc/pc/test/peerconnectiontestwrapper.cc
+++ b/webrtc/pc/test/peerconnectiontestwrapper.cc
@@ -64,13 +64,13 @@ bool PeerConnectionTestWrapper::CreatePc(
       new cricket::FakePortAllocator(network_thread_, nullptr));
 
   fake_audio_capture_module_ = FakeAudioCaptureModule::Create();
-  if (fake_audio_capture_module_ == NULL) {
+  if (fake_audio_capture_module_ == nullptr) {
     return false;
   }
 
   peer_connection_factory_ = webrtc::CreatePeerConnectionFactory(
       network_thread_, worker_thread_, rtc::Thread::Current(),
-      fake_audio_capture_module_, NULL, NULL);
+      fake_audio_capture_module_, nullptr, nullptr);
   if (!peer_connection_factory_) {
     return false;
   }
@@ -81,7 +81,7 @@ bool PeerConnectionTestWrapper::CreatePc(
       config, constraints, std::move(port_allocator), std::move(cert_generator),
       this);
 
-  return peer_connection_.get() != NULL;
+  return peer_connection_.get() != nullptr;
 }
 
 rtc::scoped_refptr<webrtc::DataChannelInterface>
@@ -149,7 +149,7 @@ void PeerConnectionTestWrapper::CreateAnswer(
 
 void PeerConnectionTestWrapper::ReceiveOfferSdp(const std::string& sdp) {
   SetRemoteDescription(SessionDescriptionInterface::kOffer, sdp);
-  CreateAnswer(NULL);
+  CreateAnswer(nullptr);
 }
 
 void PeerConnectionTestWrapper::ReceiveAnswerSdp(const std::string& sdp) {
@@ -165,7 +165,7 @@ void PeerConnectionTestWrapper::SetLocalDescription(const std::string& type,
       observer(new rtc::RefCountedObject<
                    MockSetSessionDescriptionObserver>());
   peer_connection_->SetLocalDescription(
-      observer, webrtc::CreateSessionDescription(type, sdp, NULL));
+      observer, webrtc::CreateSessionDescription(type, sdp, nullptr));
 }
 
 void PeerConnectionTestWrapper::SetRemoteDescription(const std::string& type,
@@ -177,14 +177,14 @@ void PeerConnectionTestWrapper::SetRemoteDescription(const std::string& type,
       observer(new rtc::RefCountedObject<
                    MockSetSessionDescriptionObserver>());
   peer_connection_->SetRemoteDescription(
-      observer, webrtc::CreateSessionDescription(type, sdp, NULL));
+      observer, webrtc::CreateSessionDescription(type, sdp, nullptr));
 }
 
 void PeerConnectionTestWrapper::AddIceCandidate(const std::string& sdp_mid,
                                                 int sdp_mline_index,
                                                 const std::string& candidate) {
   std::unique_ptr<webrtc::IceCandidateInterface> owned_candidate(
-      webrtc::CreateIceCandidate(sdp_mid, sdp_mline_index, candidate, NULL));
+      webrtc::CreateIceCandidate(sdp_mid, sdp_mline_index, candidate, nullptr));
   EXPECT_TRUE(peer_connection_->AddIceCandidate(owned_candidate.get()));
 }