Rename PlatformScreen implementations.

services/ui/display/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")
 import("//testing/test.gni")
 
 source_set("display") {
   sources = [
     "platform_screen.h",
     "platform_screen_delegate.h",
   ]
 
   deps = [
     "//base",
     "//ui/display",
     "//ui/gfx",
   ]
 
   if (use_ozone && is_chromeos) {
     sources += [
-      "platform_screen_impl_ozone.cc",
-      "platform_screen_impl_ozone.h",
+      "platform_screen_ozone.cc",
+      "platform_screen_ozone.h",
     ]
 
     deps += [
       "//skia",
-      "//ui/ozone:ozone",
+      "//ui/ozone",
     ]
   } else {
     sources += [
-      "platform_screen_impl.cc",
-      "platform_screen_impl.h",
+      "platform_screen_stub.cc",
+      "platform_screen_stub.h",
     ]
   }
 }
 
 if (use_ozone) {
   test("display_service_unittests") {
     sources = [
       "platform_screen_ozone_unittests.cc",
     ]
 
     deps = [
       ":display",
       "//base",
       "//base/test:run_all_unittests",
       "//base/test:test_support",
       "//testing/gmock",
       "//testing/gtest",
       "//ui/display",
       "//ui/gfx",
       "//ui/gfx:test_support",
       "//ui/ozone",
     ]
   }
 }