Revert 247926 "HID backend"

trunk/src/device/hid/hid_connection_linux.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_LINUX_H_
-#define DEVICE_HID_HID_CONNECTION_LINUX_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/platform_file.h"
-#include "base/tuple.h"
-#include "device/hid/hid_connection.h"
-#include "device/hid/hid_device_info.h"
-#include "device/hid/hid_service_linux.h"
-#include "net/base/io_buffer.h"
-
-namespace device {
-
-class HidConnectionLinux : public HidConnection,
-                           public base::MessagePumpLibevent::Watcher {
- public:
-  HidConnectionLinux(HidDeviceInfo device_info,
-                     ScopedUdevDevicePtr udev_raw_device);
-
-  virtual void Read(scoped_refptr<net::IOBuffer> buffer,
-                    size_t size,
-                    const IOCallback& callback) OVERRIDE;
-  virtual void Write(scoped_refptr<net::IOBuffer> buffer,
-                     size_t size,
-                     const IOCallback& callback) OVERRIDE;
-  virtual void GetFeatureReport(scoped_refptr<net::IOBuffer> buffer,
-                                size_t size,
-                                const IOCallback& callback) OVERRIDE;
-  virtual void SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
-                                 size_t size,
-                                 const IOCallback& callback) OVERRIDE;
-
-  bool initialized() const { return initialized_; }
-
-  // Implements base::MessagePumpLibevent::Watcher
-  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
-  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
-
- private:
-  friend class base::RefCountedThreadSafe<HidConnectionLinux>;
-  virtual ~HidConnectionLinux();
-
-  static bool FindHidrawDevNode(udev_device* parent, std::string* result);
-
-  void ProcessReadQueue();
-  void Disconnect();
-
-  base::PlatformFile device_file_;
-  base::MessagePumpLibevent::FileDescriptorWatcher device_file_watcher_;
-
-  typedef std::pair<scoped_refptr<net::IOBuffer>, size_t> PendingReport;
-  typedef Tuple3<scoped_refptr<net::IOBuffer>, size_t, IOCallback>
-      PendingRequest;
-
-  std::queue<PendingReport> input_reports_;
-  std::queue<PendingRequest> read_queue_;
-
-  bool initialized_;
-
-  DISALLOW_COPY_AND_ASSIGN(HidConnectionLinux);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_HID_HID_CONNECTION_LINUX__