Re-write many calls to WrapUnique() with MakeUnique()

device/test/usb_test_gadget_impl.cc

Index: device/test/usb_test_gadget_impl.cc
diff --git a/device/test/usb_test_gadget_impl.cc b/device/test/usb_test_gadget_impl.cc
index 8dc690b59f7e190bb2d93df23f3e9302f65f541f..5142d32f862a2e1a65b92344374f290868958825 100644
--- a/device/test/usb_test_gadget_impl.cc
+++ b/device/test/usb_test_gadget_impl.cc
@@ -218,8 +218,8 @@ class UsbGadgetFactory : public UsbService::Observer,
   std::unique_ptr<UsbTestGadget> WaitForDevice() {
     EnumerateDevices();
     run_loop_.Run();
-    return base::WrapUnique(
-        new UsbTestGadgetImpl(request_context_getter_, usb_service_, device_));
+    return base::MakeUnique<UsbTestGadgetImpl>(request_context_getter_,
+                                               usb_service_, device_);
   }
 
  private: