Use new downcast helper for blink::HTMLProgressElement

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

Bug: 891908
Change-Id: I7ee5385b2118582742a389815f8790a39e431c9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847455Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Cr-Commit-Position: refs/heads/master@{#704180}

third_party/blink/renderer/core/css/resolver/style_adjuster.cc

@@ -305,7 +305,7 @@ static void AdjustStyleForHTMLElement(ComputedStyle& style,
     // See https://drafts.csswg.org/css-display/#unbox-html
     // Some of these elements are handled with other adjustments above.
     if (IsA<HTMLBRElement>(element) || IsHTMLWBRElement(element) ||
-        IsA<HTMLMeterElement>(element) || IsHTMLProgressElement(element) ||
+        IsA<HTMLMeterElement>(element) || IsA<HTMLProgressElement>(element) ||
         IsA<HTMLCanvasElement>(element) || IsHTMLMediaElement(element) ||
         IsHTMLInputElement(element) || IsHTMLTextAreaElement(element) ||
         IsHTMLSelectElement(element)) {

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

@@ -104,7 +104,7 @@ bool ShouldIgnoreContents(const Node& node) {
   return (!element->ShouldSerializeEndTag() && !IsHTMLInputElement(*element)) ||
          IsA<HTMLIFrameElement>(*element) || IsHTMLImageElement(*element) ||
          IsA<HTMLLegendElement>(*element) || IsA<HTMLMeterElement>(*element) ||
-         IsHTMLObjectElement(*element) || IsHTMLProgressElement(*element) ||
+         IsHTMLObjectElement(*element) || IsA<HTMLProgressElement>(*element) ||
          (IsHTMLSelectElement(*element) &&
           ToHTMLSelectElement(*element).UsesMenuList()) ||
          IsHTMLStyleElement(*element) || IsHTMLScriptElement(*element) ||

third_party/blink/renderer/core/editing/iterators/text_iterator.cc

@@ -379,7 +379,7 @@ void TextIteratorAlgorithm<Strategy>::Advance() {
                         IsA<HTMLLegendElement>(html_element) ||
                         IsHTMLImageElement(html_element) ||
                         IsA<HTMLMeterElement>(html_element) ||
-                        IsHTMLProgressElement(html_element))))) {
+                        IsA<HTMLProgressElement>(html_element))))) {
             HandleReplacedElement();
           } else {
             HandleNonTextNode();

third_party/blink/renderer/core/html/shadow/progress_shadow_element.cc

@@ -41,7 +41,7 @@ ProgressShadowElement::ProgressShadowElement(Document& document)
 }
 
 HTMLProgressElement* ProgressShadowElement::ProgressElement() const {
-  return ToHTMLProgressElement(OwnerShadowHost());
+  return To<HTMLProgressElement>(OwnerShadowHost());
 }
 
 scoped_refptr<ComputedStyle>

third_party/blink/renderer/core/html/shadow/progress_shadow_element_test.cc

@@ -30,8 +30,8 @@ TEST_F(ProgressShadowElementTest, LayoutObjectIsNeeded) {
     <progress id='prog' style='-webkit-appearance:none' />
   )HTML");
 
-  HTMLProgressElement* progress =
-      ToHTMLProgressElement(GetDocument().getElementById("prog"));
+  auto* progress =
+      To<HTMLProgressElement>(GetDocument().getElementById("prog"));
   ASSERT_TRUE(progress);
 
   auto* shadow_element = To<Element>(progress->GetShadowRoot()->firstChild());

third_party/blink/renderer/core/layout/layout_progress.cc

@@ -105,7 +105,7 @@ void LayoutProgress::UpdateAnimationState() {
 }
 
 HTMLProgressElement* LayoutProgress::ProgressElement() const {
-  return ToHTMLProgressElement(GetNode());
+  return To<HTMLProgressElement>(GetNode());
 }
 
 }  // namespace blink

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

@@ -602,7 +602,7 @@ ax::mojom::Role AXNodeObject::NativeRoleIgnoringAria() const {
   if (IsA<HTMLMeterElement>(*GetNode()))
     return ax::mojom::Role::kMeter;
 
-  if (IsHTMLProgressElement(*GetNode()))
+  if (IsA<HTMLProgressElement>(*GetNode()))
     return ax::mojom::Role::kProgressIndicator;
 
   if (IsA<HTMLOutputElement>(*GetNode()))