Revert of Remove all descendant views from AXAuraObjCache when a view is removed.

ui/views/accessibility/ax_aura_obj_cache_unittest.cc

-// Copyright 2016 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/views/accessibility/ax_aura_obj_cache.h"
-#include "ui/views/test/widget_test.h"
-
-namespace views {
-namespace test {
-
-namespace {
-
-// This class can be used as a deleter for scoped_ptr<Widget>
-// to call function Widget::CloseNow automatically.
-struct WidgetCloser {
-  inline void operator()(Widget* widget) const { widget->CloseNow(); }
-};
-
-using WidgetAutoclosePtr = scoped_ptr<Widget, WidgetCloser>;
-}
-
-class AXAuraObjCacheTest : public WidgetTest {
- public:
-  AXAuraObjCacheTest() {}
-  ~AXAuraObjCacheTest() override {}
-};
-
-TEST_F(AXAuraObjCacheTest, TestViewRemoval) {
-  WidgetAutoclosePtr widget(CreateTopLevelPlatformWidget());
-  View* parent = new View();
-  widget->GetRootView()->AddChildView(parent);
-  View* child = new View();
-  parent->AddChildView(child);
-
-  AXAuraObjCache* cache = AXAuraObjCache::GetInstance();
-  AXAuraObjWrapper* ax_widget = cache->GetOrCreate(widget.get());
-  ASSERT_NE(nullptr, ax_widget);
-  AXAuraObjWrapper* ax_parent = cache->GetOrCreate(parent);
-  ASSERT_NE(nullptr, ax_parent);
-  AXAuraObjWrapper* ax_child = cache->GetOrCreate(child);
-  ASSERT_NE(nullptr, ax_child);
-
-  // Everything should have an ID, indicating it's in the cache.
-  ASSERT_GT(cache->GetID(widget.get()), 0);
-  ASSERT_GT(cache->GetID(parent), 0);
-  ASSERT_GT(cache->GetID(child), 0);
-
-  // Removing the parent view should remove both the parent and child
-  // from the cache, but leave the widget.
-  widget->GetRootView()->RemoveChildView(parent);
-  ASSERT_GT(cache->GetID(widget.get()), 0);
-  ASSERT_EQ(-1, cache->GetID(parent));
-  ASSERT_EQ(-1, cache->GetID(child));
-}
-
-}  // namespace test
-}  // namespace views