Replace NULL with nullptr in all C++ files.

webrtc/modules/desktop_capture/win/screen_capturer_win_magnifier.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 34 matching lines @@
   if (host_window_)
     DestroyWindow(host_window_);
 
   if (magnifier_initialized_)
     mag_uninitialize_func_();
 
   if (mag_lib_handle_)
     FreeLibrary(mag_lib_handle_);
 
   if (desktop_dc_)
-    ReleaseDC(NULL, desktop_dc_);
+    ReleaseDC(nullptr, desktop_dc_);
 }
 
 void ScreenCapturerWinMagnifier::Start(Callback* callback) {
   RTC_DCHECK(!callback_);
   RTC_DCHECK(callback);
   callback_ = callback;
 
   if (!InitializeMagnifier()) {
     LOG_F(LS_WARNING) << "Switching to fallback screen capturer becuase "
                          "magnifier initialization failed.";
@@ skipping 18 matching lines @@
     StartFallbackCapturer();
     fallback_capturer_->CaptureFrame();
     return;
   }
 
   int64_t capture_start_time_nanos = rtc::TimeNanos();
 
   // Switch to the desktop receiving user input if different from the current
   // one.
   std::unique_ptr<Desktop> input_desktop(Desktop::GetInputDesktop());
-  if (input_desktop.get() != NULL && !desktop_.IsSame(*input_desktop)) {
+  if (input_desktop.get() != nullptr && !desktop_.IsSame(*input_desktop)) {
     // Release GDI resources otherwise SetThreadDesktop will fail.
     if (desktop_dc_) {
-      ReleaseDC(NULL, desktop_dc_);
-      desktop_dc_ = NULL;
+      ReleaseDC(nullptr, desktop_dc_);
+      desktop_dc_ = nullptr;
     }
     // If SetThreadDesktop() fails, the thread is still assigned a desktop.
     // So we can continue capture screen bits, just from the wrong desktop.
     desktop_.SetThreadDesktop(input_desktop.release());
   }
 
   DesktopRect rect = GetScreenRect(current_screen_id_, current_device_key_);
   queue_.MoveToNextFrame();
   CreateCurrentFrameIfNecessary(rect.size());
   // CaptureImage may fail in some situations, e.g. windows8 metro mode. So
@@ skipping 41 matching lines @@
     set_window_filter_list_func_(
         magnifier_window_, MW_FILTERMODE_EXCLUDE, 1, &excluded_window_);
   }
 }
 
 bool ScreenCapturerWinMagnifier::CaptureImage(const DesktopRect& rect) {
   RTC_DCHECK(magnifier_initialized_);
 
   // Set the magnifier control to cover the captured rect. The content of the
   // magnifier control will be the captured image.
-  BOOL result = SetWindowPos(magnifier_window_, NULL, rect.left(), rect.top(),
-                             rect.width(), rect.height(), 0);
+  BOOL result = SetWindowPos(magnifier_window_, nullptr, rect.left(),
+                             rect.top(), rect.width(), rect.height(), 0);
   if (!result) {
     LOG_F(LS_WARNING) << "Failed to call SetWindowPos: " << GetLastError()
                       << ". Rect = {" << rect.left() << ", " << rect.top()
                       << ", " << rect.right() << ", " << rect.bottom() << "}";
     return false;
   }
 
   magnifier_capture_succeeded_ = false;
 
   RECT native_rect = {rect.left(), rect.top(), rect.right(), rect.bottom()};
@@ skipping 208 matching lines @@
   RTC_DCHECK(fallback_capturer_);
   if (!fallback_capturer_started_) {
     fallback_capturer_started_ = true;
 
     fallback_capturer_->Start(callback_);
     fallback_capturer_->SelectSource(current_screen_id_);
   }
 }
 
 }  // namespace webrtc