Cleanup //ui/resources from LaCros support code.

No functional changes are done.

1) Merged is_chromeos and is_chromeos_ash condition sections in .gn file
2) General clean ups.

Bug: 373972275, 377330005
Change-Id: Icd8b83161a0668d21afaf26daf9e02036c449783
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5993451


Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1378929}

ui/resources/BUILD.gn

@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/chromeos/ui_mode.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 import("//ui/webui/webui_features.gni")
@@ -153,14 +152,14 @@ repack("repack_ui_test_pak_100_percent") {
   }
 
   if (is_chromeos) {
-    sources +=
-        [ "$root_gen_dir/ui/chromeos/strings/ui_chromeos_strings_en-US.pak" ]
-    deps += [ "//ui/chromeos/strings" ]
-  }
-
-  if (is_chromeos_ash) {
-    sources += [ "$root_gen_dir/ui/chromeos/resources/ui_chromeos_resources_100_percent.pak" ]
-    deps += [ "//ui/chromeos/resources" ]
+    sources += [
+      "$root_gen_dir/ui/chromeos/resources/ui_chromeos_resources_100_percent.pak",
+      "$root_gen_dir/ui/chromeos/strings/ui_chromeos_strings_en-US.pak",
+    ]
+    deps += [
+      "//ui/chromeos/resources",
+      "//ui/chromeos/strings",
+    ]
   }
 
   if (toolkit_views) {