Replace NULL with nullptr in all C++ files.

webrtc/modules/desktop_capture/screen_drawer_win.cc

 /*
  *  Copyright (c) 2016 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 15 matching lines @@
  public:
   ScreenDrawerLockWin();
   ~ScreenDrawerLockWin() override;
 
  private:
   HANDLE mutex_;
 };
 
 ScreenDrawerLockWin::ScreenDrawerLockWin() {
   while (true) {
-    mutex_ = CreateMutex(NULL, FALSE, kMutexName);
-    if (GetLastError() != ERROR_ALREADY_EXISTS && mutex_ != NULL) {
+    mutex_ = CreateMutex(nullptr, FALSE, kMutexName);
+    if (GetLastError() != ERROR_ALREADY_EXISTS && mutex_ != nullptr) {
       break;
     } else {
       if (mutex_) {
         CloseHandle(mutex_);
       }
       SleepMs(1000);
     }
   }
 }
 
 ScreenDrawerLockWin::~ScreenDrawerLockWin() {
   CloseHandle(mutex_);
 }
 
 DesktopRect GetScreenRect() {
-  HDC hdc = GetDC(NULL);
+  HDC hdc = GetDC(nullptr);
   DesktopRect rect = DesktopRect::MakeWH(GetDeviceCaps(hdc, HORZRES),
                                          GetDeviceCaps(hdc, VERTRES));
-  ReleaseDC(NULL, hdc);
+  ReleaseDC(nullptr, hdc);
   return rect;
 }
 
 HWND CreateDrawerWindow(DesktopRect rect) {
-  HWND hwnd = CreateWindowA(
-      "STATIC", "DrawerWindow", WS_POPUPWINDOW | WS_VISIBLE, rect.left(),
-      rect.top(), rect.width(), rect.height(), NULL, NULL, NULL, NULL);
+  HWND hwnd =
+      CreateWindowA("STATIC", "DrawerWindow", WS_POPUPWINDOW | WS_VISIBLE,
+                    rect.left(), rect.top(), rect.width(), rect.height(),
+                    nullptr, nullptr, nullptr, nullptr);
   SetForegroundWindow(hwnd);
   return hwnd;
 }
 
 COLORREF ColorToRef(RgbaColor color) {
   // Windows device context does not support alpha.
   return RGB(color.red, color.green, color.blue);
 }
 
 // A ScreenDrawer implementation for Windows.
@@ skipping 34 matching lines @@
   // from processing windows ghosting feature.
   DisableProcessWindowsGhosting();
 
   // Always use stock pen (DC_PEN) and brush (DC_BRUSH).
   SelectObject(hdc_, GetStockObject(DC_PEN));
   SelectObject(hdc_, GetStockObject(DC_BRUSH));
   BringToFront();
 }
 
 ScreenDrawerWin::~ScreenDrawerWin() {
-  ReleaseDC(NULL, hdc_);
+  ReleaseDC(nullptr, hdc_);
   DestroyWindow(window_);
   // Unfortunately there is no EnableProcessWindowsGhosting() API.
 }
 
 DesktopRect ScreenDrawerWin::DrawableRegion() {
   return rect_;
 }
 
 void ScreenDrawerWin::DrawRectangle(DesktopRect rect, RgbaColor color) {
   if (rect.width() == 1 && rect.height() == 1) {
@@ skipping 66 matching lines @@
 std::unique_ptr<ScreenDrawerLock> ScreenDrawerLock::Create() {
   return std::unique_ptr<ScreenDrawerLock>(new ScreenDrawerLockWin());
 }
 
 // static
 std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() {
   return std::unique_ptr<ScreenDrawer>(new ScreenDrawerWin());
 }
 
 }  // namespace webrtc