replace NULL->nullptr in src/remoting.

remoting/host/fake_mouse_cursor_monitor.cc

 // Copyright 2014 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/host/fake_mouse_cursor_monitor.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
 
 namespace remoting {
 
-FakeMouseCursorMonitor::FakeMouseCursorMonitor() : callback_(NULL) {}
+FakeMouseCursorMonitor::FakeMouseCursorMonitor() : callback_(nullptr) {}
 
 FakeMouseCursorMonitor::~FakeMouseCursorMonitor() {}
 
 void FakeMouseCursorMonitor::Init(
     webrtc::MouseCursorMonitor::Callback* callback,
     webrtc::MouseCursorMonitor::Mode mode) {
   DCHECK(!callback_);
   DCHECK(callback);
 
   // Only shapes supported right now.
@@ skipping 14 matching lines @@
          webrtc::DesktopFrame::kBytesPerPixel * kWidth * kHeight);
 
   scoped_ptr<webrtc::MouseCursor> mouse_cursor(
       new webrtc::MouseCursor(desktop_frame.release(),
                               webrtc::DesktopVector()));
 
   callback_->OnMouseCursor(mouse_cursor.release());
 }
 
 }  // namespace remoting