replace NULL->nullptr in src/remoting.

remoting/protocol/message_decoder.cc

 // Copyright (c) 2012 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 "remoting/protocol/message_decoder.h"
 
 #include "base/logging.h"
 #include "net/base/io_buffer.h"
 #include "remoting/base/compound_buffer.h"
 #include "remoting/proto/internal.pb.h"
@@ skipping 21 matching lines @@
   int next_payload = -1;
   if (!next_payload_known_ && GetPayloadSize(&next_payload)) {
     DCHECK_NE(-1, next_payload);
     next_payload_ = next_payload;
     next_payload_known_ = true;
   }
 
   // If the next payload size is still not known or we don't have enough
   // data for parsing then exit.
   if (!next_payload_known_ || buffer_.total_bytes() < next_payload_)
-    return NULL;
+    return nullptr;
 
   CompoundBuffer* message_buffer = new CompoundBuffer();
   message_buffer->CopyFrom(buffer_, 0, next_payload_);
   message_buffer->Lock();
   buffer_.CropFront(next_payload_);
   next_payload_known_ = false;
 
   return message_buffer;
 }
 
 bool MessageDecoder::GetPayloadSize(int* size) {
   // The header has a size of 4 bytes.
   const int kHeaderSize = sizeof(int32);
 
   if (buffer_.total_bytes() < kHeaderSize)
     return false;
 
   CompoundBuffer header_buffer;
   char header[kHeaderSize];
   header_buffer.CopyFrom(buffer_, 0, kHeaderSize);
   header_buffer.CopyTo(header, kHeaderSize);
   *size = rtc::GetBE32(header);
   buffer_.CropFront(kHeaderSize);
   return true;
 }
 
 }  // namespace protocol
 }  // namespace remoting