Rename source_prereqs to inputs in the GN build.

chrome/app/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("//tools/grit/grit_rule.gni")
 
 # GYP version: chrome/chrome_resources.gyp:chrome_strings
 #              (generate_generated_resources action)
 grit("generated_resources") {
   source = "generated_resources.grd"
 }
 
 # GYP version: chrome/chrome_resources.gyp:chrome_strings_map
 action("make_generated_resources_map") {
   # Targets should depend on generated_resources_map instead.
   visibility = ":generated_resources_map"
 
   script = "//chrome/browser/metrics/variations/generate_resources_map.py"
 
-  source_prereqs = [ "$target_gen_dir/grit/generated_resources.h" ]
+  inputs = [ "$target_gen_dir/grit/generated_resources.h" ]
   outputs = [ "$target_gen_dir/generated_resources_map.cc" ]
 
-  args = rebase_path(source_prereqs, root_build_dir) +
+  args = rebase_path(inputs, root_build_dir) +
       rebase_path(outputs, root_build_dir)
 
   deps = [ ":generated_resources" ]
 }
 
 # Collect the generated .cc file from make_generated_resources_map and put it
 # in a source set so targets that depend on it will link the source rather than
 # specifying it manually. This doesn't happen in the GYP build.
 source_set("generated_resources_map") {
   sources = get_target_outputs(":make_generated_resources_map")
 }
 
 # GYP version: chrome/chrome_resources.gyp:chrome_strings
 #              (generate_google_chrome_strings action)
 grit("google_chrome_strings") {
   source = "google_chrome_strings.grd"
 }
 
 # GYP version: chrome/chrome_resources.gyp:chrome_strings
 #              (generate_chromium_strings action)
 grit("chromium_strings") {
   source = "chromium_strings.grd"
 }