Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/neteq/delay_manager_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 28 matching lines @@
   void IncreaseTime(int inc_ms);
 
   DelayManager* dm_;
   TickTimer tick_timer_;
   MockDelayPeakDetector detector_;
   uint16_t seq_no_;
   uint32_t ts_;
 };
 
 DelayManagerTest::DelayManagerTest()
-    : dm_(NULL), detector_(&tick_timer_), seq_no_(0x1234), ts_(0x12345678) {}
+    : dm_(nullptr), detector_(&tick_timer_), seq_no_(0x1234), ts_(0x12345678) {}
 
 void DelayManagerTest::SetUp() {
   EXPECT_CALL(detector_, Reset())
             .Times(1);
   dm_ = new DelayManager(kMaxNumberOfPackets, &detector_, &tick_timer_);
 }
 
 void DelayManagerTest::SetPacketAudioLength(int lengt_ms) {
   EXPECT_CALL(detector_, SetPacketAudioLength(lengt_ms));
   dm_->SetPacketAudioLength(lengt_ms);
@@ skipping 217 matching lines @@
   EXPECT_TRUE(dm_->SetMaximumDelay(10));
   EXPECT_FALSE(dm_->SetMinimumDelay(20));
 
   // Maximum delay less than minimum delay is not accepted.
   EXPECT_TRUE(dm_->SetMaximumDelay(100));
   EXPECT_TRUE(dm_->SetMinimumDelay(80));
   EXPECT_FALSE(dm_->SetMaximumDelay(60));
 }
 
 }  // namespace webrtc