Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/neteq/expand_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 26 matching lines @@
 TEST(Expand, CreateUsingFactory) {
   int fs = 8000;
   size_t channels = 1;
   BackgroundNoise bgn(channels);
   SyncBuffer sync_buffer(1, 1000);
   RandomVector random_vector;
   StatisticsCalculator statistics;
   ExpandFactory expand_factory;
   Expand* expand = expand_factory.Create(&bgn, &sync_buffer, &random_vector,
                                          &statistics, fs, channels);
-  EXPECT_TRUE(expand != NULL);
+  EXPECT_TRUE(expand != nullptr);
   delete expand;
 }
 
 namespace {
 class FakeStatisticsCalculator : public StatisticsCalculator {
  public:
   void LogDelayedPacketOutageEvent(int outage_duration_ms) override {
     last_outage_duration_ms_ = outage_duration_ms;
   }
 
@@ skipping 139 matching lines @@
 
   expand_.Reset();  // Must reset in order to start a new expand period.
   ExpandUntilMuted(num_channels_, &expand_);
   expand_.SetParametersForNormalAfterExpand();
   EXPECT_FALSE(expand_.Muted());  // Should be back to unmuted.
 }
 
 // TODO(hlundin): Write more tests.
 
 }  // namespace webrtc