Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/test/TestAllCodecs.cc

Index: webrtc/modules/audio_coding/test/TestAllCodecs.cc
diff --git a/webrtc/modules/audio_coding/test/TestAllCodecs.cc b/webrtc/modules/audio_coding/test/TestAllCodecs.cc
index 30f022660006c6a8651b72adb6556cbe1868f5fb..f96a544e53b71aab2b54d97c275224252d6a86aa 100644
--- a/webrtc/modules/audio_coding/test/TestAllCodecs.cc
+++ b/webrtc/modules/audio_coding/test/TestAllCodecs.cc
@@ -40,13 +40,12 @@ namespace webrtc {
 
 // Class for simulating packet handling.
 TestPack::TestPack()
-    : receiver_acm_(NULL),
+    : receiver_acm_(nullptr),
       sequence_number_(0),
       timestamp_diff_(0),
       last_in_timestamp_(0),
       total_bytes_(0),
-      payload_size_(0) {
-}
+      payload_size_(0) {}
 
 TestPack::~TestPack() {
 }
@@ -106,7 +105,7 @@ void TestPack::reset_payload_size() {
 TestAllCodecs::TestAllCodecs(int test_mode)
     : acm_a_(AudioCodingModule::Create(0)),
       acm_b_(AudioCodingModule::Create(1)),
-      channel_a_to_b_(NULL),
+      channel_a_to_b_(nullptr),
       test_count_(0),
       packet_size_samples_(0),
       packet_size_bytes_(0) {
@@ -115,9 +114,9 @@ TestAllCodecs::TestAllCodecs(int test_mode)
 }
 
 TestAllCodecs::~TestAllCodecs() {
-  if (channel_a_to_b_ != NULL) {
+  if (channel_a_to_b_ != nullptr) {
     delete channel_a_to_b_;
-    channel_a_to_b_ = NULL;
+    channel_a_to_b_ = nullptr;
   }
 }
 
@@ -389,7 +388,7 @@ void TestAllCodecs::RegisterSendCodec(char side, char* codec_name,
   }
 
   // Set pointer to the ACM where to register the codec.
-  AudioCodingModule* my_acm = NULL;
+  AudioCodingModule* my_acm = nullptr;
   switch (side) {
     case 'A': {
       my_acm = acm_a_.get();
@@ -403,7 +402,7 @@ void TestAllCodecs::RegisterSendCodec(char side, char* codec_name,
       break;
     }
   }
-  ASSERT_TRUE(my_acm != NULL);
+  ASSERT_TRUE(my_acm != nullptr);
 
   // Get all codec parameters before registering
   CodecInst my_codec_param;