Replace NULL with nullptr in all C++ files.

webrtc/modules/video_coding/codecs/i420/i420.cc

Index: webrtc/modules/video_coding/codecs/i420/i420.cc
diff --git a/webrtc/modules/video_coding/codecs/i420/i420.cc b/webrtc/modules/video_coding/codecs/i420/i420.cc
index d05ba7f519bf26e5a4147a65b62e2b078b3ffd36..e85bf3c517705f1978424fcd497d8b9568b15c6c 100644
--- a/webrtc/modules/video_coding/codecs/i420/i420.cc
+++ b/webrtc/modules/video_coding/codecs/i420/i420.cc
@@ -23,7 +23,7 @@ const size_t kI420HeaderSize = 4;
 namespace webrtc {
 
 I420Encoder::I420Encoder()
-    : _inited(false), _encodedImage(), _encodedCompleteCallback(NULL) {}
+    : _inited(false), _encodedImage(), _encodedCompleteCallback(nullptr) {}
 
 I420Encoder::~I420Encoder() {
   _inited = false;
@@ -33,9 +33,9 @@ I420Encoder::~I420Encoder() {
 int I420Encoder::Release() {
   // Should allocate an encoded frame and then release it here, for that we
   // actually need an init flag.
-  if (_encodedImage._buffer != NULL) {
+  if (_encodedImage._buffer != nullptr) {
     delete[] _encodedImage._buffer;
-    _encodedImage._buffer = NULL;
+    _encodedImage._buffer = nullptr;
   }
   _inited = false;
   return WEBRTC_VIDEO_CODEC_OK;
@@ -44,7 +44,7 @@ int I420Encoder::Release() {
 int I420Encoder::InitEncode(const VideoCodec* codecSettings,
                             int /*numberOfCores*/,
                             size_t /*maxPayloadSize */) {
-  if (codecSettings == NULL) {
+  if (codecSettings == nullptr) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   if (codecSettings->width < 1 || codecSettings->height < 1) {
@@ -52,16 +52,16 @@ int I420Encoder::InitEncode(const VideoCodec* codecSettings,
   }
 
   // Allocating encoded memory.
-  if (_encodedImage._buffer != NULL) {
+  if (_encodedImage._buffer != nullptr) {
     delete[] _encodedImage._buffer;
-    _encodedImage._buffer = NULL;
+    _encodedImage._buffer = nullptr;
     _encodedImage._size = 0;
   }
   const size_t newSize =
       CalcBufferSize(kI420, codecSettings->width, codecSettings->height) +
       kI420HeaderSize;
   uint8_t* newBuffer = new uint8_t[newSize];
-  if (newBuffer == NULL) {
+  if (newBuffer == nullptr) {
     return WEBRTC_VIDEO_CODEC_MEMORY;
   }
   _encodedImage._size = newSize;
@@ -78,7 +78,7 @@ int I420Encoder::Encode(const VideoFrame& inputImage,
   if (!_inited) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
-  if (_encodedCompleteCallback == NULL) {
+  if (_encodedCompleteCallback == nullptr) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
 
@@ -139,10 +139,7 @@ int I420Encoder::RegisterEncodeCompleteCallback(
 }
 
 I420Decoder::I420Decoder()
-    : _width(0),
-      _height(0),
-      _inited(false),
-      _decodeCompleteCallback(NULL) {}
+    : _width(0), _height(0), _inited(false), _decodeCompleteCallback(nullptr) {}
 
 I420Decoder::~I420Decoder() {
   Release();
@@ -150,7 +147,7 @@ I420Decoder::~I420Decoder() {
 
 int I420Decoder::InitDecode(const VideoCodec* codecSettings,
                             int /*numberOfCores */) {
-  if (codecSettings == NULL) {
+  if (codecSettings == nullptr) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   } else if (codecSettings->width < 1 || codecSettings->height < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
@@ -166,10 +163,10 @@ int I420Decoder::Decode(const EncodedImage& inputImage,
                         const RTPFragmentationHeader* /*fragmentation*/,
                         const CodecSpecificInfo* /*codecSpecificInfo*/,
                         int64_t /*renderTimeMs*/) {
-  if (inputImage._buffer == NULL) {
+  if (inputImage._buffer == nullptr) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
-  if (_decodeCompleteCallback == NULL) {
+  if (_decodeCompleteCallback == nullptr) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
   if (inputImage._length <= 0) {