mojo_application.gni - data deps are called data_deps these days.

services/clipboard/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("//mojo/public/mojo_application.gni")
 
 mojo_native_application("clipboard") {
   sources = [
     "clipboard_standalone_impl.cc",
     "clipboard_standalone_impl.h",
@@ skipping 22 matching lines @@
 
   deps = [
     "//base",
     "//mojo/application",
     "//mojo/application:test_support",
     "//mojo/common",
     "//mojo/public/cpp/bindings",
     "//mojo/services/clipboard/public/interfaces",
   ]
 
-  datadeps = [
-    ":clipboard",
-  ]
+  data_deps = [ ":clipboard" ]
 }