Use OnceCallback on Mojo interfaces in //device/gamepad

device/gamepad/public/interfaces/BUILD.gn

Index: device/gamepad/public/interfaces/BUILD.gn
diff --git a/device/gamepad/public/interfaces/BUILD.gn b/device/gamepad/public/interfaces/BUILD.gn
index c1f78e4af4ffc2129d89264c53af270a2774792f..ffbf359a52ea3c71dfbdedb0f415a048f5abead4 100644
--- a/device/gamepad/public/interfaces/BUILD.gn
+++ b/device/gamepad/public/interfaces/BUILD.gn
@@ -8,9 +8,6 @@ mojom("interfaces") {
   sources = [
     "gamepad.mojom",
   ]
-
-  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
-  use_once_callback = false
 }
 
 mojom("gamepad_struct_traits_test") {
@@ -21,7 +18,4 @@ mojom("gamepad_struct_traits_test") {
   public_deps = [
     ":interfaces",
   ]
-
-  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
-  use_once_callback = false
 }