Replace NULL with nullptr in all C++ files.

webrtc/pc/channelmanager_unittest.cc

 /*
  *  Copyright 2008 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 36 matching lines @@
             new cricket::FakeTransportController(ICEROLE_CONTROLLING)) {}
 
   virtual void SetUp() {
     fme_->SetAudioCodecs(MAKE_VECTOR(kAudioCodecs));
     fme_->SetVideoCodecs(MAKE_VECTOR(kVideoCodecs));
   }
 
   virtual void TearDown() {
     delete transport_controller_;
     delete cm_;
-    cm_ = NULL;
-    fdme_ = NULL;
-    fme_ = NULL;
+    cm_ = nullptr;
+    fdme_ = nullptr;
+    fme_ = nullptr;
   }
 
   webrtc::RtcEventLogNullImpl event_log_;
   rtc::Thread network_;
   rtc::Thread worker_;
   cricket::FakeMediaEngine* fme_;
   cricket::FakeDataEngine* fdme_;
   cricket::ChannelManager* cm_;
   cricket::FakeCall fake_call_;
   cricket::FakeMediaController fake_mc_;
@@ skipping 114 matching lines @@
   EXPECT_FALSE(cm_->SetVideoRtxEnabled(false));
 
   // Can set again after terminate.
   cm_->Terminate();
   EXPECT_TRUE(cm_->SetVideoRtxEnabled(true));
   cm_->GetSupportedVideoCodecs(&codecs);
   EXPECT_TRUE(ContainsMatchingCodec(codecs, rtx_codec));
 }
 
 }  // namespace cricket