PlatformUsbDevice   21 chrome/browser/usb/usb_device.h typedef libusb_device* PlatformUsbDevice;
PlatformUsbDevice   25 chrome/browser/usb/usb_service.h typedef struct libusb_device* PlatformUsbDevice;
PlatformUsbDevice   72 chrome/browser/usb/usb_service.h   typedef std::map<PlatformUsbDevice, scoped_refptr<UsbDevice> > DeviceMap;