Extracted UsbConfigDescriptor, UsbInterfaceDescriptor and helper classes

components/usb_service/usb_device_impl.cc

Index: components/usb_service/usb_device_impl.cc
diff --git a/components/usb_service/usb_device_impl.cc b/components/usb_service/usb_device_impl.cc
index 17c8337a15e7f67149378f011f915175bc110b52..f1d69a319fc35577d38390d060bf160055ea211b 100644
--- a/components/usb_service/usb_device_impl.cc
+++ b/components/usb_service/usb_device_impl.cc
@@ -9,6 +9,7 @@
 #include "base/stl_util.h"
 #include "components/usb_service/usb_context.h"
 #include "components/usb_service/usb_device_handle.h"
+#include "components/usb_service/usb_interface_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "third_party/libusb/src/libusb/libusb.h"
 
@@ -126,7 +127,7 @@ scoped_refptr<UsbConfigDescriptor> UsbDeviceImpl::ListInterfaces() {
   const int list_result =
       libusb_get_active_config_descriptor(platform_device_, &platform_config);
   if (list_result == 0)
-    return new UsbConfigDescriptor(platform_config);
+    return new UsbConfigDescriptorImpl(platform_config);
 
   return NULL;
 }