Skip attempting to bind a DevicePtr for a removed device.

content/renderer/usb/web_usb_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 "content/renderer/usb/web_usb_device_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 217 matching lines @@
   scoped_callbacks->onSuccess(adoptWebPtr(info.release()));
 }
 
 }  // namespace
 
 WebUSBDeviceImpl::WebUSBDeviceImpl(device::usb::DevicePtr device,
                                    const blink::WebUSBDeviceInfo& device_info)
     : device_(std::move(device)),
       device_info_(device_info),
       weak_factory_(this) {
-  device_.set_connection_error_handler([this]() { device_.reset(); });
+  if (device_)
+    device_.set_connection_error_handler([this]() { device_.reset(); });
 }
 
 WebUSBDeviceImpl::~WebUSBDeviceImpl() {}
 
 const blink::WebUSBDeviceInfo& WebUSBDeviceImpl::info() const {
   return device_info_;
 }
 
 void WebUSBDeviceImpl::open(blink::WebUSBDeviceOpenCallbacks* callbacks) {
   auto scoped_callbacks = MakeScopedUSBCallbacks(callbacks);
@@ skipping 180 matching lines @@
 
 void WebUSBDeviceImpl::reset(blink::WebUSBDeviceResetCallbacks* callbacks) {
   auto scoped_callbacks = MakeScopedUSBCallbacks(callbacks);
   if (device_)
     device_->Reset(base::Bind(&HandlePassFailDeviceOperation,
                               base::Passed(&scoped_callbacks),
                               kDeviceResetFailed));
 }
 
 }  // namespace content