replace NULL->nullptr in src/remoting.

remoting/host/desktop_resizer_win.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/host/desktop_resizer.h"
 
 #include <map>
 #include <windows.h>
 
 #include "base/logging.h"
@@ skipping 129 matching lines @@
     return;
 
   DEVMODE new_mode = best_mode_for_resolution_[resolution];
   DWORD result = ChangeDisplaySettings(&new_mode, CDS_FULLSCREEN);
   if (result != DISP_CHANGE_SUCCESSFUL)
     LOG(ERROR) << "SetResolution failed: " << result;
 }
 
 void DesktopResizerWin::RestoreResolution(const ScreenResolution& original) {
   // Restore the display mode based on the registry configuration.
-  DWORD result = ChangeDisplaySettings(NULL, 0);
+  DWORD result = ChangeDisplaySettings(nullptr, 0);
   if (result != DISP_CHANGE_SUCCESSFUL)
     LOG(ERROR) << "RestoreResolution failed: " << result;
 }
 
 // static
 bool DesktopResizerWin::IsResizeSupported() {
   // Resize is supported only on single-monitor systems.
   return GetSystemMetrics(SM_CMONITORS) == 1;
 }
 
 // static
 bool DesktopResizerWin::GetPrimaryDisplayMode(
     DWORD mode_number, DWORD flags, DEVMODE* mode) {
  memset(mode, 0, sizeof(DEVMODE));
  mode->dmSize = sizeof(DEVMODE);
- if (!EnumDisplaySettingsEx(NULL, mode_number, mode, flags))
+ if (!EnumDisplaySettingsEx(nullptr, mode_number, mode, flags))
    return false;
  return true;
 }
 
 // static
 bool DesktopResizerWin::IsModeValid(const DEVMODE& mode) {
   const DWORD kRequiredFields =
       DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL |
       DM_DISPLAYFREQUENCY | DM_DISPLAYORIENTATION;
   return (mode.dmFields & kRequiredFields) == kRequiredFields;
 }
 
 // static
 ScreenResolution DesktopResizerWin::GetModeResolution(const DEVMODE& mode) {
   DCHECK(IsModeValid(mode));
   return ScreenResolution(
       webrtc::DesktopSize(mode.dmPelsWidth, mode.dmPelsHeight),
       webrtc::DesktopVector(kDefaultDPI, kDefaultDPI));
 }
 
 scoped_ptr<DesktopResizer> DesktopResizer::Create() {
   return make_scoped_ptr(new DesktopResizerWin);
 }
 
 }  // namespace remoting