Replace NULL with nullptr in all C++ files.

webrtc/p2p/base/jseptransport_unittest.cc

Index: webrtc/p2p/base/jseptransport_unittest.cc
diff --git a/webrtc/p2p/base/jseptransport_unittest.cc b/webrtc/p2p/base/jseptransport_unittest.cc
index ccb7016e0531f82a2b5c8376772813a3f3484dfd..fd5b5b64ee6c29e3ace813b1ad61d02a045328ff 100644
--- a/webrtc/p2p/base/jseptransport_unittest.cc
+++ b/webrtc/p2p/base/jseptransport_unittest.cc
@@ -53,7 +53,7 @@ class JsepTransportTest : public testing::Test, public sigslot::has_slots<> {
 TEST_F(JsepTransportTest, TestChannelIceParameters) {
   cricket::TransportDescription local_desc(kIceUfrag1, kIcePwd1);
   ASSERT_TRUE(transport_->SetLocalTransportDescription(
-      local_desc, cricket::CA_OFFER, NULL));
+      local_desc, cricket::CA_OFFER, nullptr));
   EXPECT_TRUE(SetupChannel());
   EXPECT_EQ(cricket::ICEMODE_FULL, fake_ice_transport_->remote_ice_mode());
   EXPECT_EQ(kIceUfrag1, fake_ice_transport_->ice_ufrag());
@@ -61,7 +61,7 @@ TEST_F(JsepTransportTest, TestChannelIceParameters) {
 
   cricket::TransportDescription remote_desc(kIceUfrag1, kIcePwd1);
   ASSERT_TRUE(transport_->SetRemoteTransportDescription(
-      remote_desc, cricket::CA_ANSWER, NULL));
+      remote_desc, cricket::CA_ANSWER, nullptr));
   EXPECT_EQ(cricket::ICEMODE_FULL, fake_ice_transport_->remote_ice_mode());
   EXPECT_EQ(kIceUfrag1, fake_ice_transport_->remote_ice_ufrag());
   EXPECT_EQ(kIcePwd1, fake_ice_transport_->remote_ice_pwd());