Skip attempting to bind a DevicePtr for a removed device.

content/renderer/usb/web_usb_client_impl.cc

 // Copyright 2015 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.
 
 #include "content/renderer/usb/web_usb_client_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 143 matching lines @@
         notification->devices_added[i];
     device::usb::DevicePtr device;
     device_manager_->GetDevice(device_info->guid, mojo::GetProxy(&device));
     observer_->onDeviceConnected(blink::adoptWebPtr(new WebUSBDeviceImpl(
         std::move(device),
         mojo::ConvertTo<blink::WebUSBDeviceInfo>(device_info))));
   }
   for (size_t i = 0; i < notification->devices_removed.size(); ++i) {
     const device::usb::DeviceInfoPtr& device_info =
         notification->devices_removed[i];
-    device::usb::DevicePtr device;
-    device_manager_->GetDevice(device_info->guid, mojo::GetProxy(&device));
     observer_->onDeviceDisconnected(blink::adoptWebPtr(new WebUSBDeviceImpl(
-        std::move(device),
-        mojo::ConvertTo<blink::WebUSBDeviceInfo>(device_info))));
+        nullptr, mojo::ConvertTo<blink::WebUSBDeviceInfo>(device_info))));
   }
 }
 
 }  // namespace content