Fix leak of HID transfers and handles on Windows.

device/hid/hid_connection_win.h

 // Copyright (c) 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_WIN_H_
 #define DEVICE_HID_HID_CONNECTION_WIN_H_
 
 #include <windows.h>
 #include <stddef.h>
 #include <stdint.h>
 
-#include <set>
+#include <list>
 
 #include "base/macros.h"
 #include "base/win/scoped_handle.h"
 #include "device/hid/hid_connection.h"
 
 namespace device {
 
-struct PendingHidTransfer;
+class PendingHidTransfer;
 
 class HidConnectionWin : public HidConnection {
  public:
   HidConnectionWin(scoped_refptr<HidDeviceInfo> device_info,
                    base::win::ScopedHandle file);
 
  private:
   friend class HidServiceWin;
-  friend struct PendingHidTransfer;
+  friend class PendingHidTransfer;
 
   ~HidConnectionWin() override;
 
   // HidConnection implementation.
   void PlatformClose() override;
   void PlatformRead(const ReadCallback& callback) override;
   void PlatformWrite(scoped_refptr<net::IOBuffer> buffer,
                      size_t size,
                      const WriteCallback& callback) override;
   void PlatformGetFeatureReport(uint8_t report_id,
                                 const ReadCallback& callback) override;
   void PlatformSendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
                                  size_t size,
                                  const WriteCallback& callback) override;
 
   void OnReadComplete(scoped_refptr<net::IOBuffer> buffer,
                       const ReadCallback& callback,
                       PendingHidTransfer* transfer,
                       bool signaled);
   void OnReadFeatureComplete(scoped_refptr<net::IOBuffer> buffer,
                              const ReadCallback& callback,
                              PendingHidTransfer* transfer,
                              bool signaled);
   void OnWriteComplete(const WriteCallback& callback,
                        PendingHidTransfer* transfer,
                        bool signaled);
 
+  std::unique_ptr<PendingHidTransfer> UnlinkTransfer(
+      PendingHidTransfer* transfer);
+
   base::win::ScopedHandle file_;
 
-  std::set<scoped_refptr<PendingHidTransfer> > transfers_;
+  std::list<std::unique_ptr<PendingHidTransfer>> transfers_;
 
   DISALLOW_COPY_AND_ASSIGN(HidConnectionWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_HID_HID_CONNECTION_WIN_H_