Change UsbDeviceFilter to use const references instead of

chrome/browser/chromeos/printing/usb_printer_util.h

 // Copyright 2017 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.
 
 // Utility routines for working with UsbDevices that are printers.
 
 #ifndef CHROME_BROWSER_CHROMEOS_PRINTING_USB_PRINTER_UTIL_H__
 #define CHROME_BROWSER_CHROMEOS_PRINTING_USB_PRINTER_UTIL_H__
 
 #include <memory>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 
 namespace device {
 class UsbDevice;
 }
 
 namespace chromeos {
 
 class Printer;
 
-bool UsbDeviceIsPrinter(scoped_refptr<device::UsbDevice> usb_device);
+bool UsbDeviceIsPrinter(const device::UsbDevice& usb_device);
 
 // Convert the interesting details of a device to a string, for
 // logging/debugging.
 std::string UsbPrinterDeviceDetailsAsString(const device::UsbDevice& device);
 
 // Attempt to gather all the information we need to work with this printer by
 // querying the USB device.  This should only be called using devices we believe
 // are printers, not arbitrary USB devices, as we may get weird partial results
 // from arbitrary devices.
 //
 // Returns nullptr and logs an error on failure.
 std::unique_ptr<Printer> UsbDeviceToPrinter(const device::UsbDevice& device);
 
 // Gets the URI CUPS would use to refer to this USB device.  Assumes device
 // is a printer.
 std::string UsbPrinterUri(const device::UsbDevice& device);
 
 }  // namespace chromeos
 #endif  // CHROME_BROWSER_CHROMEOS_PRINTING_USB_PRINTER_UTIL_H__