QUIC - (no behavior change) s/NULL/nullptr/g in .../quic/...

net/tools/quic/test_tools/quic_test_utils.cc

Index: net/tools/quic/test_tools/quic_test_utils.cc
diff --git a/net/tools/quic/test_tools/quic_test_utils.cc b/net/tools/quic/test_tools/quic_test_utils.cc
index 8df57e2431cb3005dae335dd6b04d4fce9e62baf..8fdbe001c68cc0187e46494cb0d6f9e7b003063a 100644
--- a/net/tools/quic/test_tools/quic_test_utils.cc
+++ b/net/tools/quic/test_tools/quic_test_utils.cc
@@ -97,7 +97,7 @@ QuicAckFrame MakeAckFrameWithNackRanges(
 TestSession::TestSession(QuicConnection* connection,
                          const QuicConfig& config)
     : QuicSession(connection, config),
-      crypto_stream_(NULL) {
+      crypto_stream_(nullptr) {
   InitializeSession();
 }
 
@@ -129,7 +129,7 @@ MockAckNotifierDelegate::MockAckNotifierDelegate() {
 MockAckNotifierDelegate::~MockAckNotifierDelegate() {
 }
 
-TestWriterFactory::TestWriterFactory() : current_writer_(NULL) {}
+TestWriterFactory::TestWriterFactory() : current_writer_(nullptr) {}
 TestWriterFactory::~TestWriterFactory() {}
 
 QuicPacketWriter* TestWriterFactory::Create(QuicPacketWriter* writer,
@@ -138,15 +138,15 @@ QuicPacketWriter* TestWriterFactory::Create(QuicPacketWriter* writer,
 }
 
 void TestWriterFactory::OnPacketSent(WriteResult result) {
-  if (current_writer_ != NULL && result.status == WRITE_STATUS_ERROR) {
+  if (current_writer_ != nullptr && result.status == WRITE_STATUS_ERROR) {
     current_writer_->connection()->OnWriteError(result.error_code);
-    current_writer_ = NULL;
+    current_writer_ = nullptr;
   }
 }
 
 void TestWriterFactory::Unregister(PerConnectionPacketWriter* writer) {
   if (current_writer_ == writer) {
-    current_writer_ = NULL;
+    current_writer_ = nullptr;
   }
 }
 
@@ -167,9 +167,10 @@ WriteResult TestWriterFactory::PerConnectionPacketWriter::WritePacket(
     size_t buf_len,
     const IPAddressNumber& self_address,
     const IPEndPoint& peer_address) {
-  // A DCHECK(factory_current_writer_ == NULL) would be wrong here -- this class
-  // may be used in a setting where connection()->OnPacketSent() is called in a
-  // different way, so TestWriterFactory::OnPacketSent might never be called.
+  // A DCHECK(factory_current_writer_ == nullptr) would be wrong here -- this
+  // class may be used in a setting where connection()->OnPacketSent() is called
+  // in a different way, so TestWriterFactory::OnPacketSent might never be
+  // called.
   factory_->current_writer_ = this;
   return QuicPerConnectionPacketWriter::WritePacket(buffer,
                                                     buf_len,