Track USB device configuration state in Blink.

device/usb/public/interfaces/device.mojom

Index: device/usb/public/interfaces/device.mojom
diff --git a/device/usb/public/interfaces/device.mojom b/device/usb/public/interfaces/device.mojom
index de7bd5fb148e87d44187f6becd8dd4a356c42e1a..4b65a1141a12d5f06d735cdbf79695bc07fdb72c 100644
--- a/device/usb/public/interfaces/device.mojom
+++ b/device/usb/public/interfaces/device.mojom
@@ -99,6 +99,7 @@ struct DeviceInfo {
   string? manufacturer_name;
   string? product_name;
   string? serial_number;
+  uint8 active_configuration;
   array<ConfigurationInfo> configurations;
   WebUsbDescriptorSet? webusb_allowed_origins;
 };
@@ -153,10 +154,6 @@ interface Device {
   // including the set of all available device configurations.
   GetDeviceInfo() => (DeviceInfo? info);
 
-  // Retrieves the |configuration_value| of the device's currently active
-  // configuration. Will return 0 if the device is unconfigured.
-  GetConfiguration() => (uint8 value);
-
   // Opens the device. Methods below require the device be opened first.
   Open() => (OpenDeviceError error);