Views a11y: Implement AXPlatformNode::FromNativeViewAccessible on all platforms.

ui/views/accessibility/native_view_accessibility_mac.mm

Index: ui/views/accessibility/native_view_accessibility_mac.mm
diff --git a/ui/views/accessibility/native_view_accessibility_mac.mm b/ui/views/accessibility/native_view_accessibility_mac.mm
index 68e58caaa33a5158036311c8b007e0c2ea87d573..2d5801fa379154bd1e7e29736ec836df0753a215 100644
--- a/ui/views/accessibility/native_view_accessibility_mac.mm
+++ b/ui/views/accessibility/native_view_accessibility_mac.mm
@@ -9,25 +9,19 @@
 
 namespace views {
 
-// static
-NativeViewAccessibility* NativeViewAccessibility::Create(View* view) {
-  return new NativeViewAccessibilityMac(view);
-}
-
 NativeViewAccessibilityMac::NativeViewAccessibilityMac(View* view)
     : NativeViewAccessibility(view) {}
 
-gfx::NativeViewAccessible NativeViewAccessibilityMac::GetParent() {
-  if (view_->parent())
-    return view_->parent()->GetNativeViewAccessible();
-
+gfx::NativeViewAccessible
+NativeViewAccessibilityMac::GetNativeViewAccessibleForWidget() {
   if (view_->GetWidget())
     return view_->GetWidget()->GetNativeView();
+  return NativeViewAccessibility::GetNativeViewAccessibleForWidget();
+}
 
-  if (parent_widget_)
-    return parent_widget_->GetRootView()->GetNativeViewAccessible();
-
-  return nullptr;
+// static
+NativeViewAccessibility* NativeViewAccessibility::Create(View* view) {
+  return new NativeViewAccessibilityMac(view);
 }
 
 }  // namespace views