Use Mojo enum types in the C++ USB interface

device/usb/BUILD.gn

Index: device/usb/BUILD.gn
diff --git a/device/usb/BUILD.gn b/device/usb/BUILD.gn
index 76fa59e24d4b5e78d7b007d8e1b679c1a8efd7f1..0b6ad32f4e2affa30f7ae414614b67578fe177dd 100644
--- a/device/usb/BUILD.gn
+++ b/device/usb/BUILD.gn
@@ -62,6 +62,11 @@ static_library("usb") {
     "//components/device_event_log",
     "//device/base",
     "//net",
+
+    # Depend on the header generation target only to avoid the circular
+    # dependency caused by both using enums defined in the mojom headers and
+    # typemappings linking against this target.
+    "public/interfaces:interfaces__generator",
   ]
 
   if (use_udev) {