Move kInvalidDisplayID to display_constants.h.

ui/display/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")
 import("//testing/test.gni")
 
 component("display") {
   sources = [
     "android/screen_android.cc",
@@ skipping 56 matching lines @@
     "win/scaling_util.h",
     "win/screen_win.cc",
     "win/screen_win.h",
     "win/screen_win_display.cc",
     "win/screen_win_display.h",
   ]
 
   defines = [ "DISPLAY_IMPLEMENTATION" ]
 
   public_deps = [
+    "//ui/display/types",
     "//ui/gfx:gfx",
   ]
 
   deps = [
     "//base",
     "//third_party/re2",
-    "//ui/display/types",
     "//ui/display/util",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (is_chromeos && use_x11) {
     sources += [
       "chromeos/x11/display_mode_x11.cc",
       "chromeos/x11/display_mode_x11.h",
       "chromeos/x11/display_snapshot_x11.cc",
@@ skipping 136 matching lines @@
     sources -= [ "display_change_notifier_unittest.cc" ]
   }
 
   if (is_chromeos && use_ozone) {
     sources -= [
       "chromeos/x11/display_util_x11_unittest.cc",
       "chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     ]
   }
 }