Replace NULL with nullptr in all C++ files.

webrtc/voice_engine/test/channel_transport/udp_socket_manager_unittest.cc

Index: webrtc/voice_engine/test/channel_transport/udp_socket_manager_unittest.cc
diff --git a/webrtc/voice_engine/test/channel_transport/udp_socket_manager_unittest.cc b/webrtc/voice_engine/test/channel_transport/udp_socket_manager_unittest.cc
index 178474a11c2f1df804ec8b45bcb119b90a317ad7..0bd402cdf594bae4029c88890be4e58e22cac483 100644
--- a/webrtc/voice_engine/test/channel_transport/udp_socket_manager_unittest.cc
+++ b/webrtc/voice_engine/test/channel_transport/udp_socket_manager_unittest.cc
@@ -40,12 +40,11 @@ TEST(UdpSocketManager, AddAndRemoveSocketDoesNotLeakMemory) {
   uint8_t threads = 1;
   UdpSocketManager* mgr = UdpSocketManager::Create(id, threads);
   UdpSocketWrapper* socket =
-      UdpSocketWrapper::CreateSocket(id,
-                                     mgr,
-                                     NULL,  // CallbackObj
-                                     NULL,  // IncomingSocketCallback
-                                     false,  // ipV6Enable
-                                     false);  // disableGQOS
+      UdpSocketWrapper::CreateSocket(id, mgr,
+                                     nullptr,  // CallbackObj
+                                     nullptr,  // IncomingSocketCallback
+                                     false,    // ipV6Enable
+                                     false);   // disableGQOS
   // The constructor will do AddSocket on the manager.
   // RemoveSocket indirectly calls Delete.
   EXPECT_EQ(true, mgr->RemoveSocket(socket));
@@ -64,18 +63,17 @@ TEST(UdpSocketManager, UnremovedSocketsGetCollectedAtManagerDeletion) {
   int32_t id = 42;
   uint8_t threads = 1;
   UdpSocketManager* mgr = UdpSocketManager::Create(id, threads);
-  UdpSocketWrapper* unused_socket = UdpSocketWrapper::CreateSocket(
-      id,
-      mgr,
-      NULL,  // CallbackObj
-      NULL,  // IncomingSocketCallback
-      false,  // ipV6Enable
-      false);  // disableGQOS
+  UdpSocketWrapper* unused_socket =
+      UdpSocketWrapper::CreateSocket(id, mgr,
+                                     nullptr,  // CallbackObj
+                                     nullptr,  // IncomingSocketCallback
+                                     false,    // ipV6Enable
+                                     false);   // disableGQOS
   // The constructor will do AddSocket on the manager.
   // Call a member funtion to work around "set but not used" compliation
   // error on ChromeOS ARM.
   unused_socket->SetEventToNull();
-  unused_socket = NULL;
+  unused_socket = nullptr;
   UdpSocketManager::Return();
 #endif
 }