Replace NULL with nullptr in all C++ files.

webrtc/voice_engine/test/channel_transport/udp_socket_wrapper.cc

Index: webrtc/voice_engine/test/channel_transport/udp_socket_wrapper.cc
diff --git a/webrtc/voice_engine/test/channel_transport/udp_socket_wrapper.cc b/webrtc/voice_engine/test/channel_transport/udp_socket_wrapper.cc
index e02f0c5cb40934fa69b19212a3792bdfae25d293..180b26ef4243068d3aadd40099db1594476fae8e 100644
--- a/webrtc/voice_engine/test/channel_transport/udp_socket_wrapper.cc
+++ b/webrtc/voice_engine/test/channel_transport/udp_socket_wrapper.cc
@@ -37,17 +37,14 @@ bool UdpSocketWrapper::_initiated = false;
 #endif
 
 UdpSocketWrapper::UdpSocketWrapper()
-    : _wantsIncoming(false),
-      _deleteEvent(NULL)
-{
-}
+    : _wantsIncoming(false), _deleteEvent(nullptr) {}
 
 UdpSocketWrapper::~UdpSocketWrapper()
 {
     if(_deleteEvent)
     {
       _deleteEvent->Set();
-      _deleteEvent = NULL;
+      _deleteEvent = nullptr;
     }
 }
 
@@ -55,7 +52,7 @@ void UdpSocketWrapper::SetEventToNull()
 {
     if (_deleteEvent)
     {
-        _deleteEvent = NULL;
+      _deleteEvent = nullptr;
     }
 }
 
@@ -87,7 +84,7 @@ UdpSocketWrapper* UdpSocketWrapper::CreateSocket(const int32_t id,
                 "UdpSocketWrapper::CreateSocket failed to initialize sockets\
  WSAStartup error:%d",
                 err);
-            return NULL;
+            return nullptr;
         }
 
         _initiated = true;
@@ -115,21 +112,17 @@ UdpSocketWrapper* UdpSocketWrapper::CreateSocket(const int32_t id,
                 id,
                 "UdpSocketWrapper::CreateSocket failed to initialize socket");
             delete s;
-            s = NULL;
+            s = nullptr;
         }
     }
 #endif
     if (s)
     {
-        s->_deleteEvent = NULL;
-        if (!s->SetCallback(obj, cb))
-        {
-            WEBRTC_TRACE(
-                kTraceError,
-                kTraceTransport,
-                id,
-                "UdpSocketWrapper::CreateSocket failed to ser callback");
-            return(NULL);
+      s->_deleteEvent = nullptr;
+      if (!s->SetCallback(obj, cb)) {
+        WEBRTC_TRACE(kTraceError, kTraceTransport, id,
+                     "UdpSocketWrapper::CreateSocket failed to ser callback");
+        return (nullptr);
         }
     }
     return s;