Enable use_once_callback on mojom GN rule by default

chrome/common/media_router/mojo/BUILD.gn

Index: chrome/common/media_router/mojo/BUILD.gn
diff --git a/chrome/common/media_router/mojo/BUILD.gn b/chrome/common/media_router/mojo/BUILD.gn
index 84a42d5369cf4704f82784893992b26862d208f0..939e8555655adc1b735a272d1cadbf4b37e276a6 100644
--- a/chrome/common/media_router/mojo/BUILD.gn
+++ b/chrome/common/media_router/mojo/BUILD.gn
@@ -12,6 +12,9 @@ mojom("dial_utility_interfaces") {
   public_deps = [
     "//mojo/common:common_custom_types",
   ]
+
+  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
+  use_once_callback = false
 }
 
 mojom("media_controller") {
@@ -37,6 +40,9 @@ mojom("media_router") {
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
+
+  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
+  use_once_callback = false
 }
 
 mojom("media_router_test_interfaces") {
@@ -47,4 +53,7 @@ mojom("media_router_test_interfaces") {
   public_deps = [
     ":media_router",
   ]
+
+  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
+  use_once_callback = false
 }