Fix include guards in //device/usb

device/usb/usb_service_linux.h

Index: device/usb/usb_service_linux.h
diff --git a/device/usb/usb_service_linux.h b/device/usb/usb_service_linux.h
index b334de39b0e8ba145cbc87d3953175cc9b7317a8..c22bc48556b176c026e69a916df40cabe15fb4ec 100644
--- a/device/usb/usb_service_linux.h
+++ b/device/usb/usb_service_linux.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef DEVICE_USB_USB_SERVICE_LINUX_H_
+#define DEVICE_USB_USB_SERVICE_LINUX_H_
+
 #include <list>
 #include <memory>
 #include <unordered_map>
@@ -61,3 +64,5 @@ class UsbServiceLinux : public UsbService {
 };
 
 }  // namespace device
+
+#endif  // DEVICE_USB_USB_SERVICE_LINUX_H_