Remove defunct skydb debugger.

services/debugger/trace_collector.h

-// 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.
-
-#ifndef SERVICES_DEBUGGER_TRACE_COLLECTOR_H_
-#define SERVICES_DEBUGGER_TRACE_COLLECTOR_H_
-
-#include <vector>
-
-#include "base/callback.h"
-#include "mojo/data_pipe_utils/data_pipe_drainer.h"
-
-namespace debugger {
-
-class TraceCollector : public mojo::common::DataPipeDrainer::Client {
- public:
-  typedef base::Callback<void(std::string)> TraceCallback;
-
-  explicit TraceCollector(mojo::ScopedDataPipeConsumerHandle source);
-  ~TraceCollector() override;
-
-  void GetTrace(TraceCallback callback);
-
- private:
-  void OnDataAvailable(const void* data, size_t num_bytes) override;
-  void OnDataComplete() override;
-
-  std::string GetTraceAsString();
-
-  mojo::common::DataPipeDrainer drainer_;
-  std::vector<char> trace_;
-  bool is_complete_;
-  TraceCallback callback_;
-};
-
-}  // namespace debugger
-
-#endif  // SERVICES_DEBUGGER_TRACE_COLLECTOR_H_