Restructure public side of input_events service.

mojo/services/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.
 
 import("//build/config/ui.gni")
 
 group("services") {
   deps = [
     "//mojo/services/accessibility/public/interfaces",
     "//mojo/services/geometry/public/interfaces",
+    "//mojo/services/input_events/public/interfaces",
     "//mojo/services/native_viewport/public/interfaces",
     "//mojo/services/network",
     "//mojo/services/network/public/interfaces",
     "//mojo/services/public/interfaces/clipboard",
     "//mojo/services/public/interfaces/content_handler",
-    "//mojo/services/public/interfaces/input_events",
     "//mojo/services/public/interfaces/navigation",
     "//mojo/services/surfaces/public/interfaces",
   ]
 
   if (use_aura) {
     deps += [
       "//mojo/services/view_manager/public/interfaces",
       "//mojo/services/window_manager/public/interfaces",
     ]
   }
 }