Replace NULL with nullptr in all C++ files.

webrtc/base/win32filesystem.cc

Index: webrtc/base/win32filesystem.cc
diff --git a/webrtc/base/win32filesystem.cc b/webrtc/base/win32filesystem.cc
index 7e5ec832d65080eeda9587d423f241541be2d20b..ed9b69e608572eb0c1444c488088c750a1ad268a 100644
--- a/webrtc/base/win32filesystem.cc
+++ b/webrtc/base/win32filesystem.cc
@@ -60,15 +60,15 @@ bool Win32Filesystem::CreateFolder(const Pathname &pathname) {
     }
   }
 
-  return (::CreateDirectory(path16.c_str(), NULL) != 0);
+  return (::CreateDirectory(path16.c_str(), nullptr) != 0);
 }
 
 FileStream *Win32Filesystem::OpenFile(const Pathname &filename,
                                       const std::string &mode) {
   FileStream *fs = new FileStream();
-  if (fs && !fs->Open(filename.pathname().c_str(), mode.c_str(), NULL)) {
+  if (fs && !fs->Open(filename.pathname().c_str(), mode.c_str(), nullptr)) {
     delete fs;
-    fs = NULL;
+    fs = nullptr;
   }
   return fs;
 }
@@ -105,7 +105,7 @@ bool Win32Filesystem::GetTemporaryFolder(Pathname &pathname, bool create,
     return false;
   pathname.clear();
   pathname.SetFolder(ToUtf8(buffer));
-  if (append != NULL) {
+  if (append != nullptr) {
     RTC_DCHECK(!append->empty());
     pathname.AppendFolder(*append);
   }
@@ -210,7 +210,7 @@ bool Win32Filesystem::GetFileTime(const Pathname& path, FileTimeType which,
 
 bool Win32Filesystem::GetAppPathname(Pathname* path) {
   TCHAR buffer[MAX_PATH + 1];
-  if (0 == ::GetModuleFileName(NULL, buffer, arraysize(buffer)))
+  if (0 == ::GetModuleFileName(nullptr, buffer, arraysize(buffer)))
     return false;
   path->SetPathname(ToUtf8(buffer));
   return true;
@@ -221,7 +221,7 @@ bool Win32Filesystem::GetAppDataFolder(Pathname* path, bool per_user) {
   RTC_DCHECK(!application_name_.empty());
   TCHAR buffer[MAX_PATH + 1];
   int csidl = per_user ? CSIDL_LOCAL_APPDATA : CSIDL_COMMON_APPDATA;
-  if (!::SHGetSpecialFolderPath(NULL, buffer, csidl, TRUE))
+  if (!::SHGetSpecialFolderPath(nullptr, buffer, csidl, TRUE))
     return false;
   if (!IsCurrentProcessLowIntegrity() &&
       !::GetLongPathName(buffer, buffer, arraysize(buffer)))
@@ -258,7 +258,7 @@ bool Win32Filesystem::GetDiskFreeSpace(const Pathname& path,
   }
   char drive[4];
   std::wstring drive16;
-  const wchar_t* target_drive = NULL;
+  const wchar_t* target_drive = nullptr;
   if (path.GetDrive(drive, sizeof(drive))) {
     drive16 = ToUtf16(drive);
     target_drive = drive16.c_str();
@@ -268,7 +268,7 @@ bool Win32Filesystem::GetDiskFreeSpace(const Pathname& path,
     return false;
   } else {
     // The path is probably relative.  GetDriveType and GetDiskFreeSpaceEx
-    // use the current drive if NULL is passed as the drive name.
+    // use the current drive if null is passed as the drive name.
     // TODO: Add method to Pathname to determine if the path is relative.
     // TODO: Add method to Pathname to convert a path to absolute.
   }