Convert device to std::unique_ptr

device/usb/usb_context.h

Index: device/usb/usb_context.h
diff --git a/device/usb/usb_context.h b/device/usb/usb_context.h
index 1d3e5123d9a9bf5531c331af380137fade48fd26..ee3abfcabfe2def644ad17e0f6f18f1b4c9d4bea 100644
--- a/device/usb/usb_context.h
+++ b/device/usb/usb_context.h
@@ -5,9 +5,10 @@
 #ifndef DEVICE_USB_USB_CONTEXT_H_
 #define DEVICE_USB_USB_CONTEXT_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 
 struct libusb_context;
@@ -35,7 +36,7 @@ class UsbContext : public base::RefCountedThreadSafe<UsbContext> {
   class UsbEventHandler;
 
   PlatformUsbContext context_;
-  scoped_ptr<UsbEventHandler> event_handler_;
+  std::unique_ptr<UsbEventHandler> event_handler_;
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbContext);