Enable use_once_callback on mojom GN rule by default

components/web_restrictions/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/rules.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   android_library("web_restrictions_java") {
@@ skipping 45 matching lines @@
       "//content/public/browser",
       "//mojo/public/cpp/bindings:bindings",
       "//net:net",
     ]
   }
 
   mojom("interfaces") {
     sources = [
       "interfaces/web_restrictions.mojom",
     ]
-
-    use_once_callback = true
   }
 
   generate_jni("test_support_jni_headers") {
     sources = [
       "browser/javatest/src/org/chromium/components/webrestrictions/browser/MockWebRestrictionsClient.java",
     ]
     jni_package = "web_restrictions"
     deps = [
       ":web_restrictions_java",
     ]
@@ skipping 29 matching lines @@
       ":test_support",
       "//base",
       "//base/test:test_support",
       "//content/test:test_support",
       "//net",
       "//testing/gtest",
       "//url",
     ]
   }
 }