Revert of Avoid two targeting phases in aura client-lib and EventProcessor.

ui/aura/test/test_window_targeter.cc

-// Copyright 2017 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.
-
-#include "ui/aura/test/test_window_targeter.h"
-
-namespace aura {
-namespace test {
-
-TestWindowTargeter::TestWindowTargeter() {}
-
-TestWindowTargeter::~TestWindowTargeter() {}
-
-ui::EventTarget* TestWindowTargeter::FindTargetForEvent(ui::EventTarget* root,
-                                                        ui::Event* event) {
-  return root;
-}
-
-ui::EventTarget* TestWindowTargeter::FindNextBestTarget(
-    ui::EventTarget* previous_target,
-    ui::Event* event) {
-  return previous_target;
-}
-
-}  // namespace test
-}  // namespace aura