Replace NULL with nullptr.

extensions/browser/api/cast_channel/cast_transport.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/api/cast_channel/cast_transport.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/format_macros.h"
@@ skipping 384 matching lines @@
   VLOG_WITH_CONNECTION(2) << "DoReadComplete result = " << result;
 
   if (result <= 0) {
     VLOG_WITH_CONNECTION(1) << "Read error, peer closed the socket.";
     SetErrorState(CHANNEL_ERROR_SOCKET_ERROR);
     SetReadState(READ_STATE_ERROR);
     return result == 0 ? net::ERR_FAILED : result;
   }
 
   size_t message_size;
-  DCHECK(current_message_.get() == NULL);
+  DCHECK(!current_message_);
   ChannelError framing_error;
   current_message_ = framer_->Ingest(result, &message_size, &framing_error);
   if (current_message_.get() && (framing_error == CHANNEL_ERROR_NONE)) {
     DCHECK_GT(message_size, static_cast<size_t>(0));
     logger_->LogSocketEventForMessage(
         channel_id_, proto::MESSAGE_READ, current_message_->namespace_(),
         base::StringPrintf("Message size: %u",
                            static_cast<uint32>(message_size)));
     SetReadState(READ_STATE_DO_CALLBACK);
   } else if (framing_error != CHANNEL_ERROR_NONE) {
-    DCHECK(current_message_.get() == NULL);
+    DCHECK(!current_message_);
     SetErrorState(CHANNEL_ERROR_INVALID_MESSAGE);
     SetReadState(READ_STATE_ERROR);
   } else {
-    DCHECK(current_message_.get() == NULL);
+    DCHECK(!current_message_);
     SetReadState(READ_STATE_READ);
   }
   return net::OK;
 }
 
 int CastTransportImpl::DoReadCallback() {
   VLOG_WITH_CONNECTION(2) << "DoReadCallback";
   if (!IsCastMessageValid(*current_message_)) {
     SetReadState(READ_STATE_ERROR);
     SetErrorState(CHANNEL_ERROR_INVALID_MESSAGE);
@@ skipping 12 matching lines @@
 int CastTransportImpl::DoReadError(int result) {
   VLOG_WITH_CONNECTION(2) << "DoReadError";
   DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
   DCHECK_LE(result, 0);
   return net::ERR_FAILED;
 }
 
 }  // namespace cast_channel
 }  // namespace core_api
 }  // namespace extensions