Remove DisplayStructTraitsTest interface.

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 = [
     "display.cc",
@@ skipping 150 matching lines @@
   deps = [
     ":display",
     ":display_manager_test_api",
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//mojo/edk/test:run_all_unittests",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/display/manager",
-    "//ui/display/mojo:test_interfaces",
+    "//ui/display/mojo:interfaces",
     "//ui/display/types",
     "//ui/display/util",
     "//ui/events/devices",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
   ]
 
   if (is_android) {
     # Do not run display_change_notifier_unittest.cc on Android because it
     # does not compile display_observer.cc
     sources -= [ "display_change_notifier_unittest.cc" ]
   }
 
   if (is_chromeos && use_x11) {
     sources += [
       "manager/chromeos/x11/display_util_x11_unittest.cc",
       "manager/chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     ]
   }
 }