Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/test/APITest.cc

Index: webrtc/modules/audio_coding/test/APITest.cc
diff --git a/webrtc/modules/audio_coding/test/APITest.cc b/webrtc/modules/audio_coding/test/APITest.cc
index 1b9981341b504ff28e076727f3b1cc66f41cf5df..25fb6df8b3893b398853c61cd8b76bd1cab2375e 100644
--- a/webrtc/modules/audio_coding/test/APITest.cc
+++ b/webrtc/modules/audio_coding/test/APITest.cc
@@ -51,17 +51,17 @@ void APITest::Wait(uint32_t waitLengthMs) {
 APITest::APITest()
     : _acmA(AudioCodingModule::Create(1)),
       _acmB(AudioCodingModule::Create(2)),
-      _channel_A2B(NULL),
-      _channel_B2A(NULL),
+      _channel_A2B(nullptr),
+      _channel_B2A(nullptr),
       _writeToFile(true),
-      _pullEventA(NULL),
-      _pushEventA(NULL),
-      _processEventA(NULL),
-      _apiEventA(NULL),
-      _pullEventB(NULL),
-      _pushEventB(NULL),
-      _processEventB(NULL),
-      _apiEventB(NULL),
+      _pullEventA(nullptr),
+      _pushEventA(nullptr),
+      _processEventA(nullptr),
+      _apiEventA(nullptr),
+      _pullEventB(nullptr),
+      _pushEventB(nullptr),
+      _processEventB(nullptr),
+      _apiEventB(nullptr),
       _codecCntrA(0),
       _codecCntrB(0),
       _thereIsEncoderA(false),
@@ -80,8 +80,8 @@ APITest::APITest()
       _dotMoveDirectionA(1),
       _dotPositionB(39),
       _dotMoveDirectionB(-1),
-      _vadCallbackA(NULL),
-      _vadCallbackB(NULL),
+      _vadCallbackA(nullptr),
+      _vadCallbackB(nullptr),
       _apiTestRWLock(*RWLockWrapper::CreateRWLock()),
       _randomTest(false),
       _testNumA(0),
@@ -270,18 +270,18 @@ int16_t APITest::SetUp() {
       (webrtc::test::OutputPath() + "acm_api_trace.txt").c_str());
 
   printf("\nRandom Test (y/n)?");
-  EXPECT_TRUE(fgets(print, 10, stdin) != NULL);
+  EXPECT_TRUE(fgets(print, 10, stdin) != nullptr);
   print[10] = '\0';
-  if (strstr(print, "y") != NULL) {
+  if (strstr(print, "y") != nullptr) {
     _randomTest = true;
     _verbose = false;
     _writeToFile = false;
   } else {
     _randomTest = false;
     printf("\nPrint Tests (y/n)? ");
-    EXPECT_TRUE(fgets(print, 10, stdin) != NULL);
+    EXPECT_TRUE(fgets(print, 10, stdin) != nullptr);
     print[10] = '\0';
-    if (strstr(print, "y") == NULL) {
+    if (strstr(print, "y") == nullptr) {
       EXPECT_TRUE(freopen("APITest_log.txt", "w", stdout) != 0);
       _verbose = false;
     }
@@ -603,7 +603,7 @@ void APITest::CheckVADStatus(char side) {
 
   if (side == 'A') {
     _acmA->VAD(&dtxEnabled, &vadEnabled, &vadMode);
-    _acmA->RegisterVADCallback(NULL);
+    _acmA->RegisterVADCallback(nullptr);
     _vadCallbackA->Reset();
     _acmA->RegisterVADCallback(_vadCallbackA);
 
@@ -634,7 +634,7 @@ void APITest::CheckVADStatus(char side) {
   } else {
     _acmB->VAD(&dtxEnabled, &vadEnabled, &vadMode);
 
-    _acmB->RegisterVADCallback(NULL);
+    _acmB->RegisterVADCallback(nullptr);
     _vadCallbackB->Reset();
     _acmB->RegisterVADCallback(_vadCallbackB);