Enable use_once_callback on mojom GN rule by default

content/shell/BUILD.gn

 # Copyright 2014 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/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//media/media_options.gni")
@@ skipping 755 matching lines @@
 mojom("mojo_bindings") {
   sources = [
     "common/layout_test.mojom",
     "common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom",
   ]
   public_deps = [
     "//mojo/common:common_custom_types",
     "//ui/gfx/geometry/mojo",
     "//url/mojo:url_mojom_gurl",
   ]
-
-  use_once_callback = true
 }
 
 group("content_shell_crash_test") {
   testonly = true
   data_deps = [
     ":content_shell",
     "//third_party/mesa:osmesa",
   ]
   data = [
     "//content/shell/tools/breakpad_integration_test.py",
@@ skipping 23 matching lines @@
     data_deps += [
       "//breakpad:dump_syms",
       "//breakpad:microdump_stackwalk",
       "//breakpad:minidump_dump",
       "//breakpad:minidump_stackwalk",
       "//breakpad:symupload",
       "//tools/android/forwarder2",
     ]
   }
 }