Track USB device configuration state in Blink.

chrome/browser/devtools/device/usb/android_usb_browsertest.cc

Index: chrome/browser/devtools/device/usb/android_usb_browsertest.cc
diff --git a/chrome/browser/devtools/device/usb/android_usb_browsertest.cc b/chrome/browser/devtools/device/usb/android_usb_browsertest.cc
index cbd9052ae9ce0ccd07e63afd4e9accb33c1ecbcc..0d90ae47b6c1ada24d66c777bcd7b6a6df812cf7 100644
--- a/chrome/browser/devtools/device/usb/android_usb_browsertest.cc
+++ b/chrome/browser/devtools/device/usb/android_usb_browsertest.cc
@@ -421,7 +421,7 @@ class MockUsbDevice : public UsbDevice {
                                             new MockUsbDeviceHandle<T>(this))));
   }
 
-  const UsbConfigDescriptor* GetActiveConfiguration() override {
+  const UsbConfigDescriptor* GetActiveConfiguration() const override {
     return T::kConfigured ? &config_desc_ : nullptr;
   }