Split Mandoline-specific components out of mojo:core_services.

mandoline/ui/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/ui.gni")
 
 group("ui") {
-  deps = [
-    "phone_ui",
-  ]
+  deps = []
   if (use_aura) {
     deps += [
       "desktop_ui",
       "omnibox",
     ]
+  } else if (is_android) {
+    deps += [ "phone_ui" ]
   }
 }