Reland: Remove aura and make a pure mojo::View version of FocusController.

sky/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("//tools/grit/grit_rule.gni")
 
 group("sky") {
   testonly = true
 
   deps = [
     "//mojo",
     "//sky/engine/platform:platform_unittests",
     "//sky/engine/web:sky_unittests",
     "//sky/engine/wtf:unittests",
     "//sky/services/inspector",
+    "//sky/tools/debugger",
+    "//sky/tools/tester",
     "//sky/viewer",
   ]
-  if (use_aura) {
-    deps += [
-      "//sky/tools/debugger",
-      "//sky/tools/tester",
-    ]
-  }
   if (!is_android) {
     deps += [ "//third_party/mesa:osmesa" ]
   }
 }