Rename source_prereqs to inputs in the GN build.

components/policy/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("//third_party/protobuf/proto_library.gni")
 import("//tools/grit/grit_rule.gni")
 
 if (is_component_build) {
   component("policy_component") {
@@ skipping 43 matching lines @@
 
   action("cloud_policy_code_generate") {
     script = "tools/generate_policy_source.py"
 
     if (is_chromeos) {
       chromeos_flag = "1"
     } else {
       chromeos_flag = "0"
     }
 
-    source_prereqs = [
+    inputs = [
       "resources/policy_templates.json",
     ]
     outputs = [
       constants_header_path,
       constants_source_path,
       protobuf_decoder_path,
       chrome_settings_proto_path,
       cloud_policy_proto_path,
     ]
 
@@ skipping 103 matching lines @@
       ":policy_component",
       ":test_support",
       "//components/policy/proto",
       "//testing/gmock",
       "//testing/gtest",
     ]
   }
 }
 
 #TODO(GYP) policy templates, chrome_manifest_bundle