Use new downcast helper for blink::HTMLAudioElement

This CL has two goals,
1. Use To<HTMLAudioElement> and DynamicTo<HTMLAudioElement> as new downcast
   helper.
2. Use IsA<HTMLAudioElement>(element) in place of
   IsHTMLAudioElement(element)

Bug: 891908
Change-Id: I787075e911bdbd7371b1827a017f5dcdc1abf0a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726430Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Cr-Commit-Position: refs/heads/master@{#682600}

third_party/blink/renderer/core/css/css_default_style_sheets.cc

@@ -195,7 +195,7 @@ bool CSSDefaultStyleSheets::EnsureDefaultStyleSheetsForElement(
   }
 
   if (!media_controls_style_sheet_ && HasMediaControlsStyleSheetLoader() &&
-      (IsHTMLVideoElement(element) || IsHTMLAudioElement(element))) {
+      (IsHTMLVideoElement(element) || IsA<HTMLAudioElement>(element))) {
     // FIXME: We should assert that this sheet only contains rules for <video>
     // and <audio>.
     media_controls_style_sheet_ =

third_party/blink/renderer/core/editing/finder/find_buffer.cc

@@ -108,7 +108,7 @@ bool ShouldIgnoreContents(const Node& node) {
          (IsHTMLSelectElement(*element) &&
           ToHTMLSelectElement(*element).UsesMenuList()) ||
          IsHTMLStyleElement(*element) || IsHTMLScriptElement(*element) ||
-         IsHTMLVideoElement(*element) || IsHTMLAudioElement(*element) ||
+         IsHTMLVideoElement(*element) || IsA<HTMLAudioElement>(*element) ||
          (element->GetDisplayLockContext() &&
           !element->GetDisplayLockContext()->IsActivatable());
 }

third_party/blink/renderer/core/frame/web_local_frame_impl.cc

@@ -2507,7 +2507,7 @@ void WebLocalFrameImpl::PerformMediaPlayerAction(
     const WebMediaPlayerAction& action) {
   HitTestResult result = HitTestResultForVisualViewportPos(location);
   Node* node = result.InnerNode();
-  if (!IsHTMLVideoElement(*node) && !IsHTMLAudioElement(*node))
+  if (!IsHTMLVideoElement(*node) && !IsA<HTMLAudioElement>(*node))
     return;
 
   HTMLMediaElement* media_element = ToHTMLMediaElement(node);

third_party/blink/renderer/core/html/media/html_media_element.h

@@ -756,7 +756,7 @@ class CORE_EXPORT HTMLMediaElement
 };
 
 inline bool IsHTMLMediaElement(const HTMLElement& element) {
-  return IsHTMLAudioElement(element) || IsHTMLVideoElement(element);
+  return IsA<HTMLAudioElement>(element) || IsHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);

third_party/blink/renderer/core/html/track/text_track_container.cc

@@ -159,7 +159,7 @@ void TextTrackContainer::UpdateDisplay(HTMLMediaElement& media_element,
   // 1. If the media element is an audio element, or is another playback
   // mechanism with no rendering area, abort these steps. There is nothing to
   // render.
-  if (IsHTMLAudioElement(media_element))
+  if (IsA<HTMLAudioElement>(media_element))
     return;
 
   // 2. Let video be the media element or other playback mechanism.

third_party/blink/renderer/core/page/context_menu_controller.cc

@@ -277,7 +277,7 @@ bool ContextMenuController::ShowContextMenu(LocalFrame* frame,
                 media_element))
           data.media_flags |= WebContextMenuData::kMediaPictureInPicture;
       }
-    } else if (IsHTMLAudioElement(*media_element))
+    } else if (IsA<HTMLAudioElement>(*media_element))
       data.media_type = WebContextMenuData::kMediaTypeAudio;
 
     data.suggested_filename = media_element->title();

third_party/blink/renderer/modules/accessibility/ax_node_object.cc

@@ -599,7 +599,7 @@ ax::mojom::Role AXNodeObject::NativeRoleIgnoringAria() const {
   if (IsHTMLDListElement(*GetNode()))
     return ax::mojom::Role::kDescriptionList;
 
-  if (IsHTMLAudioElement(*GetNode()))
+  if (IsA<HTMLAudioElement>(*GetNode()))
     return ax::mojom::Role::kAudio;
   if (IsHTMLVideoElement(*GetNode()))
     return ax::mojom::Role::kVideo;

third_party/blink/renderer/modules/media_controls/media_controls_impl.cc

@@ -2007,7 +2007,7 @@ void MediaControlsImpl::UpdateActingAsAudioControls() {
 }
 
 bool MediaControlsImpl::ShouldShowAudioControls() const {
-  return (MediaElement().IsHTMLAudioElement() || is_acting_as_audio_controls_);
+  return IsA<HTMLAudioElement>(MediaElement()) || is_acting_as_audio_controls_;
 }
 
 bool MediaControlsImpl::ShouldShowVideoControls() const {