Rename source_prereqs to inputs in the GN build.

content/browser/devtools/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")
 
 # In GYP: devtools_resources target.
 group("resources") {
   deps = [
     ":devtools_resources",
     ":devtools_protocol_constants",
   ]
 }
 
 # In GYP: devtools_resources action in the devtools_resources target.
 action("devtools_resources") {
   visibility = ":resources"
 
   # This can't use grit_rule.gni because the grd file is generated at build
   # time, so the trick of using grit_info to get the real inputs/outputs at GYP
   # time isn't possible.
   script = "//tools/grit/grit.py"
 
   grdfile = "$root_gen_dir/devtools/devtools_resources.grd"
 
-  source_prereqs = [ grdfile ] +
+  inputs = [ grdfile ] +
     rebase_path(exec_script("//tools/grit/grit_info.py", [ "--inputs" ],
                             "list lines"),
                 ".", "//")
 
   out_dir = "$root_gen_dir/webkit"
   outputs = [
     "$out_dir/grit/devtools_resources.h",
     "$out_dir/devtools_resources.pak",
     "$out_dir/grit/devtools_resources_map.cc",
     "$out_dir/grit/devtools_resources_map.h",
@@ skipping 13 matching lines @@
   ]
 }
 
 action("devtools_protocol_constants") {
   visibility = ":resources"
 
   script = "//content/public/browser/devtools_protocol_constants_generator.py"
 
   blink_protocol = "//third_party/WebKit/Source/devtools/protocol.json"
   browser_protocol = "browser_protocol.json"
-  source_prereqs = [ blink_protocol, browser_protocol ]
+  inputs = [ blink_protocol, browser_protocol ]
 
   outputs = [
     "$target_gen_dir/devtools_protocol_constants.cc",
     "$target_gen_dir/devtools_protocol_constants.h",
   ]
 
   args = [ "content" ] + rebase_path(outputs, root_build_dir) + [
     rebase_path(blink_protocol, root_build_dir),
     rebase_path(browser_protocol, root_build_dir),
   ]
 }