Move GN obj files to target-specific dirs

components/wallpaper/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.
 
 component("wallpaper") {
   sources = [
     "wallpaper_layout.h",
     "wallpaper_resizer.cc",
     "wallpaper_resizer.h",
     "wallpaper_resizer_observer.h",
   ]
 
   defines = [ "WALLPAPER_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//base:prefs",
     "//content",
     "//skia",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//url",
   ]
   if (is_chromeos) {
     sources += [
       "wallpaper_manager_base.cc",
       "wallpaper_manager_base.h",
     ]
+    public_deps = [
+      "//third_party/icu",
+    ]
     deps += [
       "//chromeos",
       "//components/user_manager",
       "//content/public/browser",
     ]
   }
 }