MacViews/a11y: Implement NativeViewAccessibilityMac.

ui/views/accessibility/native_view_accessibility.cc

 // Copyright (c) 2013 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/native_view_accessibility.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/controls/native/native_view_host.h"
@@ skipping 109 matching lines @@
 gfx::NativeWindow NativeViewAccessibility::GetTopLevelWidget() {
   if (view_->GetWidget())
     return view_->GetWidget()->GetTopLevelWidget()->GetNativeWindow();
   return nullptr;
 }
 
 gfx::NativeViewAccessible NativeViewAccessibility::GetParent() {
   if (view_->parent())
     return view_->parent()->GetNativeViewAccessible();
 
-  // TODO: move this to NativeViewAccessibilityMac.
-#if defined(OS_MACOSX)
-  if (view_->GetWidget())
-    return view_->GetWidget()->GetNativeView();
-#endif
-
   if (parent_widget_)
     return parent_widget_->GetRootView()->GetNativeViewAccessible();
 
   return nullptr;
 }
 
 gfx::Vector2d NativeViewAccessibility::GetGlobalCoordinateOffset() {
   return gfx::Vector2d(0, 0);  // location is already in screen coordinates.
 }
 
@@ skipping 130 matching lines @@
               child_widget_platform_node->GetDelegate());
       if (child_widget_view_accessibility->parent_widget() != widget)
         child_widget_view_accessibility->SetParentWidget(widget);
     }
 
     result_child_widgets->push_back(child_widget);
   }
 }
 
 }  // namespace views