Handle USB device disconnection during early setup.

device/usb/mojo/device_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 "device/usb/mojo/device_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 154 matching lines @@
         interface->first_interface, config->configuration_value, device_);
   } else if (config) {
     return permission_provider_->HasConfigurationPermission(
         config->configuration_value, device_);
   } else {
     // Client must already have device permission to have gotten this far.
     return true;
   }
 }
 
-void DeviceImpl::OnOpen(const OpenCallback& callback,
+// static
+void DeviceImpl::OnOpen(base::WeakPtr<DeviceImpl> self,
+                        const OpenCallback& callback,
                         scoped_refptr<UsbDeviceHandle> handle) {
-  device_handle_ = handle;
-  if (device_handle_ && permission_provider_)
-    permission_provider_->IncrementConnectionCount();
-  callback.Run(handle ? OpenDeviceError::OK : OpenDeviceError::ACCESS_DENIED);
+  if (!self) {
+    handle->Close();
+    return;
+  }
+
+  self->device_handle_ = std::move(handle);
+  if (self->device_handle_ && self->permission_provider_)
+    self->permission_provider_->IncrementConnectionCount();
+  callback.Run(self->device_handle_ ? OpenDeviceError::OK
+                                    : OpenDeviceError::ACCESS_DENIED);
 }
 
 void DeviceImpl::OnPermissionGrantedForOpen(const OpenCallback& callback,
                                             bool granted) {
   if (granted && permission_provider_ &&
       permission_provider_->HasDevicePermission(device_)) {
     device_->Open(
         base::Bind(&DeviceImpl::OnOpen, weak_factory_.GetWeakPtr(), callback));
   } else {
     callback.Run(OpenDeviceError::ACCESS_DENIED);
@@ skipping 241 matching lines @@
       base::Bind(&OnIsochronousTransferOut, callback));
 }
 
 void DeviceImpl::OnDeviceRemoved(scoped_refptr<UsbDevice> device) {
   DCHECK_EQ(device_, device);
   delete this;
 }
 
 }  // namespace usb
 }  // namespace device