view_manager: Remove PlatformViewport abstraction.

components/view_manager/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")
 import("//mojo/public/mojo_application.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 102 matching lines @@
     "//cc/surfaces:surface_id",
     "//components/view_manager/public/cpp:common",
     "//components/view_manager/public/interfaces",
     "//components/view_manager/native_viewport",
     "//mojo/application/public/cpp",
     "//mojo/common:tracing_impl",
     "//mojo/converters/geometry",
     "//mojo/converters/input_events",
     "//mojo/converters/surfaces",
     "//third_party/mojo/src/mojo/public/cpp/bindings:callback",
-    "//ui/mojo/geometry:interfaces",
-    "//ui/mojo/events:interfaces",
+    "//ui/events",
+    "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
+    "//ui/mojo/events:interfaces",
+    "//ui/mojo/geometry:interfaces",
+    "//ui/platform_window:platform_impls",
   ]
 }
 
 source_set("test_support") {
   testonly = true
 
   sources = [
     "test_change_tracker.cc",
     "test_change_tracker.h",
   ]
@@ skipping 74 matching lines @@
     "//components/view_manager/public/cpp",
     "//components/view_manager/public/cpp/tests:test_support",
     "//components/view_manager/public/interfaces",
     "//mojo/application/public/cpp:test_support",
     "//ui/mojo/geometry:interfaces",
     "//ui/mojo/geometry:util",
   ]
 
   data_deps = [ ":view_manager" ]
 }