mash: makes ash/public/cpp bundle ash/public/interfaces

mash/common/BUILD.gn

 # Copyright 2016 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")
 
 source_set("common") {
   sources = [
     "config.cc",
     "config.h",
   ]
 
   deps = [
     "//base",
   ]
 
   if (use_ash) {
-    deps += [ "//ash/public/interfaces" ]
+    deps += [ "//ash/public/cpp:ash_public_cpp" ]
   }
 }