Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/neteq/audio_decoder_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 82 matching lines @@
  protected:
   AudioDecoderTest()
       : input_audio_(
             webrtc::test::ResourcePath("audio_coding/testfile32kHz", "pcm"),
             32000),
         codec_input_rate_hz_(32000),  // Legacy default value.
         frame_size_(0),
         data_length_(0),
         channels_(1),
         payload_type_(17),
-        decoder_(NULL) {}
+        decoder_(nullptr) {}
 
   virtual ~AudioDecoderTest() {}
 
   virtual void SetUp() {
     if (audio_encoder_)
       codec_input_rate_hz_ = audio_encoder_->SampleRateHz();
     // Create arrays.
     ASSERT_GT(data_length_, 0u) << "The test must set data_length_ > 0";
   }
 
   virtual void TearDown() {
     delete decoder_;
-    decoder_ = NULL;
+    decoder_ = nullptr;
   }
 
   virtual void InitEncoder() { }
 
   // TODO(henrik.lundin) Change return type to size_t once most/all overriding
   // implementations are gone.
   virtual int EncodeFrame(const int16_t* input,
                           size_t input_len_samples,
                           rtc::Buffer* output) {
     AudioEncoder::EncodedInfo encoded_info;
@@ skipping 562 matching lines @@
   EXPECT_TRUE(CodecSupported(NetEqDecoder::kDecoderCNGnb));
   EXPECT_TRUE(CodecSupported(NetEqDecoder::kDecoderCNGwb));
   EXPECT_TRUE(CodecSupported(NetEqDecoder::kDecoderCNGswb32kHz));
   EXPECT_TRUE(CodecSupported(NetEqDecoder::kDecoderCNGswb48kHz));
   EXPECT_TRUE(CodecSupported(NetEqDecoder::kDecoderArbitrary));
   EXPECT_EQ(has_opus, CodecSupported(NetEqDecoder::kDecoderOpus));
   EXPECT_EQ(has_opus, CodecSupported(NetEqDecoder::kDecoderOpus_2ch));
 }
 
 }  // namespace webrtc