Replace NULL with nullptr in all C++ files.

webrtc/modules/desktop_capture/win/desktop.cc

Index: webrtc/modules/desktop_capture/win/desktop.cc
diff --git a/webrtc/modules/desktop_capture/win/desktop.cc b/webrtc/modules/desktop_capture/win/desktop.cc
index 97bbfb717b106728694c45b4b3f57abb8debd48e..10fc636353dc84078a80a22062ea85776de33c47 100644
--- a/webrtc/modules/desktop_capture/win/desktop.cc
+++ b/webrtc/modules/desktop_capture/win/desktop.cc
@@ -20,7 +20,7 @@ Desktop::Desktop(HDESK desktop, bool own) : desktop_(desktop), own_(own) {
 }
 
 Desktop::~Desktop() {
-  if (own_ && desktop_ != NULL) {
+  if (own_ && desktop_ != nullptr) {
     if (!::CloseDesktop(desktop_)) {
       LOG(LS_ERROR) << "Failed to close the owned desktop handle: "
                     << GetLastError();
@@ -29,11 +29,11 @@ Desktop::~Desktop() {
 }
 
 bool Desktop::GetName(std::wstring* desktop_name_out) const {
-  if (desktop_ == NULL)
+  if (desktop_ == nullptr)
     return false;
 
   DWORD length = 0;
-  int rv = GetUserObjectInformationW(desktop_, UOI_NAME, NULL, 0, &length);
+  int rv = GetUserObjectInformationW(desktop_, UOI_NAME, nullptr, 0, &length);
   if (rv || GetLastError() != ERROR_INSUFFICIENT_BUFFER)
     abort();
 
@@ -77,10 +77,10 @@ Desktop* Desktop::GetDesktop(const WCHAR* desktop_name) {
       DESKTOP_HOOKCONTROL | DESKTOP_WRITEOBJECTS | DESKTOP_READOBJECTS |
       DESKTOP_SWITCHDESKTOP | GENERIC_WRITE;
   HDESK desktop = OpenDesktop(desktop_name, 0, FALSE, desired_access);
-  if (desktop == NULL) {
+  if (desktop == nullptr) {
     LOG(LS_ERROR) << "Failed to open the desktop '" << desktop_name << "': "
                   << GetLastError();
-    return NULL;
+    return nullptr;
   }
 
   return new Desktop(desktop, true);
@@ -89,19 +89,19 @@ Desktop* Desktop::GetDesktop(const WCHAR* desktop_name) {
 Desktop* Desktop::GetInputDesktop() {
   HDESK desktop = OpenInputDesktop(
       0, FALSE, GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE);
-  if (desktop == NULL)
-    return NULL;
+  if (desktop == nullptr)
+    return nullptr;
 
   return new Desktop(desktop, true);
 }
 
 Desktop* Desktop::GetThreadDesktop() {
   HDESK desktop = ::GetThreadDesktop(GetCurrentThreadId());
-  if (desktop == NULL) {
+  if (desktop == nullptr) {
     LOG(LS_ERROR) << "Failed to retrieve the handle of the desktop assigned to "
                      "the current thread: "
                   << GetLastError();
-    return NULL;
+    return nullptr;
   }
 
   return new Desktop(desktop, false);