replace NULL->nullptr in src/remoting.

remoting/client/plugin/pepper_input_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/client/plugin/pepper_input_handler.h"
 
 #include "base/logging.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/input_event.h"
 #include "ppapi/cpp/module_impl.h"
@@ skipping 42 matching lines @@
     pp::Point delta = pp_mouse_event.GetMovement();
     mouse_event.set_delta_x(delta.x());
     mouse_event.set_delta_y(delta.y());
   }
   return mouse_event;
 }
 
 }  // namespace
 
 PepperInputHandler::PepperInputHandler()
-    : input_stub_(NULL),
+    : input_stub_(nullptr),
       has_focus_(false),
       send_mouse_input_when_unfocused_(false),
       send_mouse_move_deltas_(false),
       wheel_delta_x_(0),
       wheel_delta_y_(0),
       wheel_ticks_x_(0),
       wheel_ticks_y_(0) {
 }
 
 bool PepperInputHandler::HandleInputEvent(const pp::InputEvent& event) {
@@ skipping 120 matching lines @@
   }
 
   return false;
 }
 
 void PepperInputHandler::DidChangeFocus(bool has_focus) {
   has_focus_ = has_focus;
 }
 
 }  // namespace remoting