Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/ssladapter_unittest.cc

Index: webrtc/base/ssladapter_unittest.cc
diff --git a/webrtc/base/ssladapter_unittest.cc b/webrtc/base/ssladapter_unittest.cc
index c591f19658f30d19acfa9a338ccf7ddd2ce59a65..c8afbe6a75371b4f69d02cdce311b60bcbcd559f 100644
--- a/webrtc/base/ssladapter_unittest.cc
+++ b/webrtc/base/ssladapter_unittest.cc
@@ -165,8 +165,8 @@ class SSLAdapterTestDummyServer : public sigslot::has_slots<> {
   }
 
   int Send(const std::string& message) {
-    if (ssl_stream_adapter_ == NULL
-        || ssl_stream_adapter_->GetState() != rtc::SS_OPEN) {
+    if (ssl_stream_adapter_ == nullptr ||
+        ssl_stream_adapter_->GetState() != rtc::SS_OPEN) {
       // No connection yet.
       return -1;
     }
@@ -187,7 +187,7 @@ class SSLAdapterTestDummyServer : public sigslot::has_slots<> {
 
   void AcceptConnection(const rtc::SocketAddress& address) {
     // Only a single connection is supported.
-    ASSERT_TRUE(ssl_stream_adapter_ == NULL);
+    ASSERT_TRUE(ssl_stream_adapter_ == nullptr);
 
     // This is only for DTLS.
     ASSERT_EQ(rtc::SSL_MODE_DTLS, ssl_mode_);
@@ -202,9 +202,9 @@ class SSLAdapterTestDummyServer : public sigslot::has_slots<> {
 
   void OnServerSocketReadEvent(rtc::AsyncSocket* socket) {
     // Only a single connection is supported.
-    ASSERT_TRUE(ssl_stream_adapter_ == NULL);
+    ASSERT_TRUE(ssl_stream_adapter_ == nullptr);
 
-    DoHandshake(server_socket_->Accept(NULL));
+    DoHandshake(server_socket_->Accept(nullptr));
   }
 
   void OnSSLStreamAdapterEvent(rtc::StreamInterface* stream, int sig, int err) {
@@ -274,7 +274,7 @@ class SSLAdapterTestBase : public testing::Test,
   explicit SSLAdapterTestBase(const rtc::SSLMode& ssl_mode,
                               const rtc::KeyParams& key_params)
       : ssl_mode_(ssl_mode),
-        ss_scope_(new rtc::VirtualSocketServer(NULL)),
+        ss_scope_(new rtc::VirtualSocketServer(nullptr)),
         server_(new SSLAdapterTestDummyServer(ssl_mode_, key_params)),
         client_(new SSLAdapterTestDummyClient(ssl_mode_)),
         handshake_wait_(kTimeout) {}