Remove //mojo/platform_handle

components/mus/public/cpp/tests/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")
 
 source_set("unittest_support") {
   testonly = true
 
@@ skipping 51 matching lines @@
     ":unittest_support",
     "//base",
     "//base/test:test_support",
     "//components/mus/common:mus_common",
     "//components/mus/public/cpp",
     "//mojo/common:common_base",
     "//mojo/converters/geometry",
     "//mojo/converters/input_events",
     "//mojo/edk/system",
     "//mojo/gles2",
-    "//mojo/platform_handle:platform_handle_impl",
     "//mojo/public/cpp/system",
     "//services/shell/public/cpp",
     "//testing/gtest",
     "//ui/events",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/mojo/geometry:interfaces",
   ]
 
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
   }
 }