Add missing base files to GN build.

content/browser/devtools/BUILD.gn

Index: content/browser/devtools/BUILD.gn
diff --git a/content/browser/devtools/BUILD.gn b/content/browser/devtools/BUILD.gn
index ffeb2491809cf04f3b7026b02cdfb6042a87968c..c24b60e2686cd6467cd4cabf0cc3a335633fe5f4 100644
--- a/content/browser/devtools/BUILD.gn
+++ b/content/browser/devtools/BUILD.gn
@@ -13,36 +13,20 @@ group("resources") {
 }
 
 # 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 = "$root_gen_dir/devtools/devtools_resources.grd"
+grit("devtools_resources") {
+  source = "$root_gen_dir/devtools/devtools_resources.grd"
 
-  inputs = [ grdfile ] +
-    rebase_path(exec_script("//tools/grit/grit_info.py", [ "--inputs" ],
-                            "list lines"),
-                ".", "//")
-
-  out_dir = "$root_gen_dir/webkit"
+  output_dir = "$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",
+    "grit/devtools_resources.h",
+    "devtools_resources.pak",
+    "grit/devtools_resources_map.cc",
+    "grit/devtools_resources_map.h",
   ]
 
-  args = [
-    "-i", rebase_path(grdfile, root_build_dir), "build",
-    "-f", rebase_path("//tools/gritsettings/resource_ids", root_build_dir),
-    "-o", rebase_path(out_dir, root_build_dir),
-    "-D", "SHARED_INTERMEDIATE_DIR=" +
-      rebase_path(root_gen_dir, root_build_dir),
-  ] + grit_defines
+  defines = [
+    "SHARED_INTERMEDIATE_DIR=" + rebase_path(root_gen_dir, root_build_dir),
+  ]
 
   deps = [
     # This is the action that generates out .grd input file.