Delete the tracing service

services/tracing/data_sink.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 "services/tracing/data_sink.h"
-
-#include <utility>
-
-#include "base/logging.h"
-#include "mojo/common/data_pipe_utils.h"
-
-using mojo::common::BlockingCopyFromString;
-
-namespace tracing {
-
-DataSink::DataSink(mojo::ScopedDataPipeProducerHandle pipe)
-    : pipe_(std::move(pipe)), empty_(true) {}
-
-DataSink::~DataSink() {
-  if (pipe_.is_valid())
-    pipe_.reset();
-  DCHECK(!pipe_.is_valid());
-}
-
-void DataSink::AddChunk(const std::string& json) {
-  if (!empty_)
-    BlockingCopyFromString(",", pipe_);
-  empty_ = false;
-  BlockingCopyFromString(json, pipe_);
-}
-
-}  // namespace tracing