AX: Update macOS attribute initializers to be more modern

• Component: Accessibility
• Status: NEW ---

[chris fleizach]

> Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperMac.mm:1601
> +        auto tempArray = adoptNS([[NSMutableArray alloc] initWithArray:attributes]);
> +        [tempArray addObject:NSAccessibilityEmbeddedImageDescriptionAttribute];
> +        [tempArray addObject:NSAccessibilityURLAttribute];
> +        imageAttrs = tempArray.leakRef();
> +    }


adoptNS(...).leakRef() seems to be a no-op, so I'm not sure what it's doing here. This applies to all the other initializers in this function as well.

Additionally, it's a little weird that every attribute dictionary is initialized the first time this method is called, rather than have a separate static/NeverDestroyed method for each, so the cost is only paid when at item of the specific type is passed in.

[Radar WebKit Bug Importer]

<rdar://problem/74489846>