Revert 247926 "HID backend"

trunk/src/device/hid/hid_connection.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 DEVICE_HID_HID_CONNECTION_H_
-#define DEVICE_HID_HID_CONNECTION_H_
-
-#include "base/callback.h"
-#include "base/memory/ref_counted.h"
-#include "base/threading/thread_checker.h"
-#include "device/hid/hid_device_info.h"
-
-namespace net {
-class IOBuffer;
-}
-
-namespace device {
-
-class HidConnection : public base::RefCountedThreadSafe<HidConnection> {
- public:
-  typedef base::Callback<void(bool success, size_t size)> IOCallback;
-
-  virtual void Read(scoped_refptr<net::IOBuffer> buffer,
-                    size_t size,
-                    const IOCallback& callback) = 0;
-  virtual void Write(scoped_refptr<net::IOBuffer> buffer,
-                     size_t size,
-                     const IOCallback& callback) = 0;
-  virtual void GetFeatureReport(scoped_refptr<net::IOBuffer> buffer,
-                                size_t size,
-                                const IOCallback& callback) = 0;
-  virtual void SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
-                                 size_t size,
-                                 const IOCallback& callback) = 0;
-
-  const HidDeviceInfo& device_info() const;
-
- protected:
-  friend class base::RefCountedThreadSafe<HidConnection>;
-  friend struct HidDeviceInfo;
-
-  HidConnection(HidDeviceInfo device_info);
-  virtual ~HidConnection();
-
-  const HidDeviceInfo device_info_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(HidConnection);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_HID_HID_CONNECTION_H_