Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/neteq/packet_buffer_unittest.cc

 /*
  *  Copyright (c) 2012 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 432 matching lines @@
     Packet packet = gen.NextPacket(payload_len);
     packet.payload.Clear();
     EXPECT_EQ(PacketBuffer::kInvalidPacket,
               buffer->InsertPacket(std::move(packet)));
   }
   // Buffer should still be empty. Test all empty-checks.
   uint32_t temp_ts;
   EXPECT_EQ(PacketBuffer::kBufferEmpty, buffer->NextTimestamp(&temp_ts));
   EXPECT_EQ(PacketBuffer::kBufferEmpty,
             buffer->NextHigherTimestamp(0, &temp_ts));
-  EXPECT_EQ(NULL, buffer->PeekNextPacket());
+  EXPECT_EQ(nullptr, buffer->PeekNextPacket());
   EXPECT_FALSE(buffer->GetNextPacket());
   EXPECT_EQ(PacketBuffer::kBufferEmpty, buffer->DiscardNextPacket());
   EXPECT_EQ(0, buffer->DiscardAllOldPackets(0));  // 0 packets discarded.
 
   // Insert one packet to make the buffer non-empty.
   EXPECT_EQ(PacketBuffer::kOK,
             buffer->InsertPacket(gen.NextPacket(payload_len)));
-  EXPECT_EQ(PacketBuffer::kInvalidPointer, buffer->NextTimestamp(NULL));
+  EXPECT_EQ(PacketBuffer::kInvalidPointer, buffer->NextTimestamp(nullptr));
   EXPECT_EQ(PacketBuffer::kInvalidPointer,
-            buffer->NextHigherTimestamp(0, NULL));
+            buffer->NextHigherTimestamp(0, nullptr));
   delete buffer;
 
   // Insert packet list of three packets, where the second packet has an invalid
   // payload.  Expect first packet to be inserted, and the remaining two to be
   // discarded.
   buffer = new PacketBuffer(100, &tick_timer);  // 100 packets.
   PacketList list;
   list.push_back(gen.NextPacket(payload_len));  // Valid packet.
   {
     Packet packet = gen.NextPacket(payload_len);
@@ skipping 184 matching lines @@
 // Test the IsObsoleteTimestamp method with different limit timestamps.
 TEST(PacketBuffer, IsObsoleteTimestamp) {
   TestIsObsoleteTimestamp(0);
   TestIsObsoleteTimestamp(1);
   TestIsObsoleteTimestamp(0xFFFFFFFF);  // -1 in uint32_t.
   TestIsObsoleteTimestamp(0x80000000);  // 2^31.
   TestIsObsoleteTimestamp(0x80000001);  // 2^31 + 1.
   TestIsObsoleteTimestamp(0x7FFFFFFF);  // 2^31 - 1.
 }
 }  // namespace webrtc