Add chrome/browser/ui to the GN build.

ash/resources/BUILD.gn

Index: ash/resources/BUILD.gn
diff --git a/content/public/plugin/BUILD.gn b/ash/resources/BUILD.gn
similarity index 64%
copy from content/public/plugin/BUILD.gn
copy to ash/resources/BUILD.gn
index 059aea60ebde90b69dc745b093d184dd8a793019..bb7de97dc586a4866af00a582313b5658a971237 100644
--- a/content/public/plugin/BUILD.gn
+++ b/ash/resources/BUILD.gn
@@ -2,8 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("plugin") {
-  sources = [
-    "content_plugin_client.h",
-  ]
+import("//tools/grit/grit_rule.gni")
+
+grit("resources") {
+  source = "ash_resources.grd"
 }