replace NULL->nullptr in src/remoting.

remoting/protocol/clipboard_filter.cc

Index: remoting/protocol/clipboard_filter.cc
diff --git a/remoting/protocol/clipboard_filter.cc b/remoting/protocol/clipboard_filter.cc
index d82547f8971316217ea4b5fbfd474a3104d2757c..e45140e28f0d102a7bcfc278ebdf4bc56f17ad81 100644
--- a/remoting/protocol/clipboard_filter.cc
+++ b/remoting/protocol/clipboard_filter.cc
@@ -8,7 +8,7 @@
 namespace remoting {
 namespace protocol {
 
-ClipboardFilter::ClipboardFilter() : clipboard_stub_(NULL), enabled_(true) {
+ClipboardFilter::ClipboardFilter() : clipboard_stub_(nullptr), enabled_(true) {
 }
 
 ClipboardFilter::ClipboardFilter(ClipboardStub* clipboard_stub)
@@ -23,7 +23,7 @@ void ClipboardFilter::set_clipboard_stub(ClipboardStub* clipboard_stub) {
 }
 
 void ClipboardFilter::InjectClipboardEvent(const ClipboardEvent& event) {
-  if (enabled_ && clipboard_stub_ != NULL)
+  if (enabled_ && clipboard_stub_ != nullptr)
     clipboard_stub_->InjectClipboardEvent(event);
 }