Update ui/vector_icons/BUILD.gn to use new gn template.

ui/vector_icons/BUILD.gn

Index: ui/vector_icons/BUILD.gn
diff --git a/ui/vector_icons/BUILD.gn b/ui/vector_icons/BUILD.gn
index 65c6c155aac8dc63057b4088b5e39b200c4c65e6..c299793bdac314f5bbd52448ed92f067a10106c9 100644
--- a/ui/vector_icons/BUILD.gn
+++ b/ui/vector_icons/BUILD.gn
@@ -2,45 +2,23 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-action("aggregate_vector_icons") {
-  visibility = [ ":*" ]
+import("//ui/vector_icons/vector_icons.gni")
 
-  script = "//ui/gfx/vector_icons/aggregate_vector_icons.py"
+aggregate_vector_icons("ui_vector_icons") {
+  icon_directory = "."
 
   icons = [
     "close.1x.icon",
     "close.icon",
   ]
-
-  output_cc = "$target_gen_dir/vector_icons.cc"
-  output_h = "$target_gen_dir/vector_icons.h"
-
-  inputs = icons
-  inputs += [
-    "vector_icons.cc.template",
-    "vector_icons.h.template",
-  ]
-  outputs = [
-    output_cc,
-    output_h,
-  ]
-
-  response_file_contents = rebase_path(icons, root_build_dir)
-
-  args = [
-    "--working_directory=" + rebase_path("./"),
-    "--file_list={{response_file_name}}",
-    "--output_cc=" + rebase_path(output_cc, root_build_dir),
-    "--output_h=" + rebase_path(output_h, root_build_dir),
-  ]
 }
 
 static_library("vector_icons") {
-  sources = get_target_outputs(":aggregate_vector_icons")
+  sources = get_target_outputs(":ui_vector_icons")
   sources += [ "//ui/gfx/vector_icon_types.h" ]
 
   deps = [
-    ":aggregate_vector_icons",
+    ":ui_vector_icons",
     "//base",
     "//skia",
   ]