Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc

Index: webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc b/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
index febea2f869fe7ca94897015ac2d35df7219233b7..1041c624ee5e617315145b924717ef00d377f713 100644
--- a/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
@@ -71,12 +71,11 @@ class OpusTest : public TestWithParam<::testing::tuple<int, int>> {
 };
 
 OpusTest::OpusTest()
-    : opus_encoder_(NULL),
-      opus_decoder_(NULL),
+    : opus_encoder_(nullptr),
+      opus_decoder_(nullptr),
       encoded_bytes_(0),
       channels_(static_cast<size_t>(::testing::get<0>(GetParam()))),
-      application_(::testing::get<1>(GetParam())) {
-}
+      application_(::testing::get<1>(GetParam())) {}
 
 void OpusTest::PrepareSpeechData(size_t channel, int block_length_ms,
                                  int loop_length_ms) {
@@ -306,13 +305,13 @@ TEST(OpusTest, OpusCreateFail) {
   WebRtcOpusDecInst* opus_decoder;
 
   // Test to see that an invalid pointer is caught.
-  EXPECT_EQ(-1, WebRtcOpus_EncoderCreate(NULL, 1, 0));
+  EXPECT_EQ(-1, WebRtcOpus_EncoderCreate(nullptr, 1, 0));
   // Invalid channel number.
   EXPECT_EQ(-1, WebRtcOpus_EncoderCreate(&opus_encoder, 3, 0));
   // Invalid applciation mode.
   EXPECT_EQ(-1, WebRtcOpus_EncoderCreate(&opus_encoder, 1, 2));
 
-  EXPECT_EQ(-1, WebRtcOpus_DecoderCreate(NULL, 1));
+  EXPECT_EQ(-1, WebRtcOpus_DecoderCreate(nullptr, 1));
   // Invalid channel number.
   EXPECT_EQ(-1, WebRtcOpus_DecoderCreate(&opus_decoder, 3));
 }
@@ -320,8 +319,8 @@ TEST(OpusTest, OpusCreateFail) {
 // Test failing Free.
 TEST(OpusTest, OpusFreeFail) {
   // Test to see that an invalid pointer is caught.
-  EXPECT_EQ(-1, WebRtcOpus_EncoderFree(NULL));
-  EXPECT_EQ(-1, WebRtcOpus_DecoderFree(NULL));
+  EXPECT_EQ(-1, WebRtcOpus_EncoderFree(nullptr));
+  EXPECT_EQ(-1, WebRtcOpus_DecoderFree(nullptr));
 }
 
 // Test normal Create and Free.
@@ -330,8 +329,8 @@ TEST_P(OpusTest, OpusCreateFree) {
                                         channels_,
                                         application_));
   EXPECT_EQ(0, WebRtcOpus_DecoderCreate(&opus_decoder_, channels_));
-  EXPECT_TRUE(opus_encoder_ != NULL);
-  EXPECT_TRUE(opus_decoder_ != NULL);
+  EXPECT_TRUE(opus_encoder_ != nullptr);
+  EXPECT_TRUE(opus_decoder_ != nullptr);
   // Free encoder and decoder memory.
   EXPECT_EQ(0, WebRtcOpus_EncoderFree(opus_encoder_));
   EXPECT_EQ(0, WebRtcOpus_DecoderFree(opus_decoder_));