Destroy DeviceImpl when the underlying UsbDevice is disconnected.

device/usb/mojo/device_impl_unittest.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 <stdint.h>
 
 #include <map>
@@ skipping 429 matching lines @@
 
   std::set<uint8_t> claimed_interfaces_;
 
   FakePermissionProvider permission_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(USBDeviceImplTest);
 };
 
 }  // namespace
 
+TEST_F(USBDeviceImplTest, Disconnect) {
+  DevicePtr device = GetMockDeviceProxy();
+
+  base::RunLoop loop;
+  device.set_connection_error_handler(loop.QuitClosure());
+  mock_device().NotifyDeviceRemoved();
+  loop.Run();
+}
+
 TEST_F(USBDeviceImplTest, Open) {
   DevicePtr device = GetMockDeviceProxy();
 
   EXPECT_FALSE(is_device_open());
 
   EXPECT_CALL(mock_device(), Open(_));
 
   {
     base::RunLoop loop;
     device->Open(base::Bind(&ExpectOpenAndThen, OpenDeviceError::OK,
@@ skipping 430 matching lines @@
         base::Bind(&ExpectPacketsInAndThen, fake_inbound_data,
                    expected_transferred_lengths, loop.QuitClosure()));
     loop.Run();
   }
 
   EXPECT_CALL(mock_handle(), Close());
 }
 
 }  // namespace usb
 }  // namespace device