replace NULL->nullptr in src/remoting.

remoting/protocol/input_filter.cc

Index: remoting/protocol/input_filter.cc
diff --git a/remoting/protocol/input_filter.cc b/remoting/protocol/input_filter.cc
index 66ea2d12d5cb78d3982b11a7f0988a2cd5787a37..44bc24726165582a51e7952c6c00d5e3b4a87e71 100644
--- a/remoting/protocol/input_filter.cc
+++ b/remoting/protocol/input_filter.cc
@@ -7,7 +7,7 @@
 namespace remoting {
 namespace protocol {
 
-InputFilter::InputFilter() : input_stub_(NULL), enabled_(true) {
+InputFilter::InputFilter() : input_stub_(nullptr), enabled_(true) {
 }
 
 InputFilter::InputFilter(InputStub* input_stub)
@@ -18,17 +18,17 @@ InputFilter::~InputFilter() {
 }
 
 void InputFilter::InjectKeyEvent(const KeyEvent& event) {
-  if (enabled_ && input_stub_ != NULL)
+  if (enabled_ && input_stub_ != nullptr)
     input_stub_->InjectKeyEvent(event);
 }
 
 void InputFilter::InjectTextEvent(const TextEvent& event) {
-  if (enabled_ && input_stub_ != NULL)
+  if (enabled_ && input_stub_ != nullptr)
     input_stub_->InjectTextEvent(event);
 }
 
 void InputFilter::InjectMouseEvent(const MouseEvent& event) {
-  if (enabled_ && input_stub_ != NULL)
+  if (enabled_ && input_stub_ != nullptr)
     input_stub_->InjectMouseEvent(event);
 }