Remove unnecessary code for <dialog> 'open' presentation attribute

This code was added in [1] to work around a bug [2] in the layout test
system that doesn't seem to still reproduce. The "open" attribute is
not a presentation attribute, so it shouldn't be marked as one.

This should not change any behavior.

[1] https://source.chromium.org/chromium/chromium/src/+/f56b6ef2b68e305e106e0310fd884c620861fb8b
[2] https://bugs.webkit.org/show_bug.cgi?id=91058

Change-Id: If03bf98075db8b94e56f27370199a36e508106b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640923
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Yu Han <yuzhehan@chromium.org>
Reviewed-by: Yu Han <yuzhehan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845895}

third_party/blink/renderer/core/html/html_dialog_element.cc

@@ -195,17 +195,6 @@ void HTMLDialogElement::RemovedFrom(ContainerNode& insertion_point) {
   InertSubtreesChanged(GetDocument());
 }
 
-bool HTMLDialogElement::IsPresentationAttribute(
-    const QualifiedName& name) const {
-  // FIXME: Workaround for <https://bugs.webkit.org/show_bug.cgi?id=91058>:
-  // modifying an attribute for which there is an attribute selector in html.css
-  // sometimes does not trigger a style recalc.
-  if (name == html_names::kOpenAttr)
-    return true;
-
-  return HTMLElement::IsPresentationAttribute(name);
-}
-
 void HTMLDialogElement::DefaultEventHandler(Event& event) {
   if (event.type() == event_type_names::kCancel) {
     close();

third_party/blink/renderer/core/html/html_dialog_element.h

@@ -33,7 +33,6 @@ namespace blink {
 
 class Document;
 class ExceptionState;
-class QualifiedName;
 
 class HTMLDialogElement final : public HTMLElement {
   DEFINE_WRAPPERTYPEINFO();
@@ -54,7 +53,6 @@ class HTMLDialogElement final : public HTMLElement {
   }
 
  private:
-  bool IsPresentationAttribute(const QualifiedName&) const override;
   void DefaultEventHandler(Event&) override;
 
   void SetIsModal(bool is_modal);