Replace NULL with nullptr in all C++ files.

webrtc/modules/video_coding/jitter_buffer.cc

Index: webrtc/modules/video_coding/jitter_buffer.cc
diff --git a/webrtc/modules/video_coding/jitter_buffer.cc b/webrtc/modules/video_coding/jitter_buffer.cc
index 345bdf7e1a44fba1b4e0aaf80418db1edd594e7e..6d05bd2962aa757beeaa6b5ba83253696991881b 100644
--- a/webrtc/modules/video_coding/jitter_buffer.cc
+++ b/webrtc/modules/video_coding/jitter_buffer.cc
@@ -60,7 +60,7 @@ void FrameList::InsertFrame(VCMFrameBuffer* frame) {
 VCMFrameBuffer* FrameList::PopFrame(uint32_t timestamp) {
   FrameList::iterator it = find(timestamp);
   if (it == end())
-    return NULL;
+    return nullptr;
   VCMFrameBuffer* frame = it->second;
   erase(it);
   return frame;
@@ -531,7 +531,7 @@ bool VCMJitterBuffer::NextMaybeIncompleteTimestamp(uint32_t* timestamp) {
 VCMEncodedFrame* VCMJitterBuffer::ExtractAndSetDecode(uint32_t timestamp) {
   CriticalSectionScoped cs(crit_sect_);
   if (!running_) {
-    return NULL;
+    return nullptr;
   }
   // Extract the frame with the desired timestamp.
   VCMFrameBuffer* frame = decodable_frames_.PopFrame(timestamp);
@@ -541,7 +541,7 @@ VCMEncodedFrame* VCMJitterBuffer::ExtractAndSetDecode(uint32_t timestamp) {
     if (frame)
       continuous = last_decoded_state_.ContinuousFrame(frame);
     else
-      return NULL;
+      return nullptr;
   }
   TRACE_EVENT_ASYNC_STEP0("webrtc", "Video", timestamp, "Extract");
   // Frame pulled out from jitter buffer, update the jitter estimate.
@@ -593,20 +593,20 @@ VCMFrameBufferEnum VCMJitterBuffer::GetFrame(const VCMPacket& packet,
                                              VCMFrameBuffer** frame,
                                              FrameList** frame_list) {
   *frame = incomplete_frames_.PopFrame(packet.timestamp);
-  if (*frame != NULL) {
+  if (*frame != nullptr) {
     *frame_list = &incomplete_frames_;
     return kNoError;
   }
   *frame = decodable_frames_.PopFrame(packet.timestamp);
-  if (*frame != NULL) {
+  if (*frame != nullptr) {
     *frame_list = &decodable_frames_;
     return kNoError;
   }
 
-  *frame_list = NULL;
+  *frame_list = nullptr;
   // No match, return empty frame.
   *frame = GetEmptyFrame();
-  if (*frame == NULL) {
+  if (*frame == nullptr) {
     // No free frame! Try to reclaim some...
     LOG(LS_WARNING) << "Unable to get empty frame; Recycling.";
     bool found_key_frame = RecycleFramesUntilKeyFrame();
@@ -645,7 +645,7 @@ VCMFrameBufferEnum VCMJitterBuffer::InsertPacket(const VCMPacket& packet,
     if (packet.sizeBytes > 0) {
       num_discarded_packets_++;
       num_consecutive_old_packets_++;
-      if (stats_callback_ != NULL)
+      if (stats_callback_ != nullptr)
         stats_callback_->OnDiscardedPacketsUpdated(num_discarded_packets_);
     }
     // Update last decoded sequence number if the packet arrived late and
@@ -791,7 +791,7 @@ VCMFrameBufferEnum VCMJitterBuffer::InsertPacket(const VCMPacket& packet,
     case kOutOfBoundsPacket:
     case kDuplicatePacket: {
       // Put back the frame where it came from.
-      if (frame_list != NULL) {
+      if (frame_list != nullptr) {
         frame_list->InsertFrame(frame);
       } else {
         RecycleFrameBuffer(frame);
@@ -1033,7 +1033,7 @@ VCMFrameBuffer* VCMJitterBuffer::NextFrame() const {
     return decodable_frames_.Front();
   if (!incomplete_frames_.empty())
     return incomplete_frames_.Front();
-  return NULL;
+  return nullptr;
 }
 
 bool VCMJitterBuffer::UpdateNackList(uint16_t sequence_number) {
@@ -1131,7 +1131,7 @@ void VCMJitterBuffer::RegisterStatsCallback(
 VCMFrameBuffer* VCMJitterBuffer::GetEmptyFrame() {
   if (free_frames_.empty()) {
     if (!TryToIncreaseJitterBufferSize()) {
-      return NULL;
+      return nullptr;
     }
   }
   VCMFrameBuffer* frame = free_frames_.front();
@@ -1204,7 +1204,7 @@ void VCMJitterBuffer::CountFrame(const VCMFrameBuffer& frame) {
       ++receive_statistics_.delta_frames;
     }
 
-    if (stats_callback_ != NULL)
+    if (stats_callback_ != nullptr)
       stats_callback_->OnFrameCountsUpdated(receive_statistics_);
   }
 }