Use new downcast helper for SVG{DefsElement|CircleElement|A}Element

This CL has below goals,
  1. Use To<SVGDefsElement> and DynamicTo<SVGDefsElement> as new
     downcast helper
  2. Use IsA<SVGDefsElement>(element) in place of
     IsSVGDefsElement(element)
  3. Use To<SVGCircleElement> and DynamicTo<SVGCircleElement> as new
     downcast helper
  4. Use IsA<SVGCircleElement>(element) in place of
     IsSVGCircleElement(element)
  5. Use DynamicTo<SVGAElement> as new downcast helper
  6. Use IsA<SVGAElement>(element) in place of IsSVGAElement(element)

Bug: 891908
Change-Id: If2c1706899083e924a7efc762e403c81a6c6c211
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946193
Commit-Queue: Abhijeet | Igalia <abhijeet@igalia.com>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720882}

third_party/blink/renderer/core/dom/element.cc

@@ -5440,7 +5440,7 @@ KURL Element::HrefURL() const {
   if (IsA<HTMLAnchorElement>(*this) || IsA<HTMLAreaElement>(*this) ||
       IsA<HTMLLinkElement>(*this))
     return GetURLAttribute(html_names::kHrefAttr);
-  if (auto* svg_a = ToSVGAElementOrNull(*this))
+  if (auto* svg_a = DynamicTo<SVGAElement>(*this))
     return svg_a->LegacyHrefURL(GetDocument());
   return KURL();
 }

third_party/blink/renderer/core/layout/svg/layout_svg_ellipse.cc

@@ -85,7 +85,7 @@ void LayoutSVGEllipse::CalculateRadiiAndCenter() {
   center_ =
       length_context.ResolveLengthPair(svg_style.Cx(), svg_style.Cy(), style);
 
-  if (IsSVGCircleElement(*GetElement())) {
+  if (IsA<SVGCircleElement>(*GetElement())) {
     float radius = length_context.ValueForLength(svg_style.R(), style,
                                                  SVGLengthMode::kOther);
     radii_ = FloatSize(radius, radius);

third_party/blink/renderer/core/layout/svg/layout_svg_inline.cc

@@ -36,10 +36,10 @@ bool LayoutSVGInline::IsChildAllowed(LayoutObject* child,
   if (child->IsText())
     return SVGLayoutSupport::IsLayoutableTextNode(child);
 
-  if (IsSVGAElement(*GetNode())) {
+  if (IsA<SVGAElement>(*GetNode())) {
     Node* child_node = child->GetNode();
     // Disallow direct descendant 'a'.
-    if (child_node && IsSVGAElement(*child_node))
+    if (child_node && IsA<SVGAElement>(*child_node))
       return false;
   }
 

third_party/blink/renderer/core/layout/svg/layout_svg_transformable_container.cc

@@ -56,11 +56,11 @@ bool LayoutSVGTransformableContainer::IsChildAllowed(
     // Reject this child if it isn't the first valid node.
     if (HasValidPredecessor(child_node))
       return false;
-  } else if (IsSVGAElement(*GetElement())) {
+  } else if (IsA<SVGAElement>(*GetElement())) {
     // http://www.w3.org/2003/01/REC-SVG11-20030114-errata#linking-text-environment
     // The 'a' element may contain any element that its parent may contain,
     // except itself.
-    if (child_node && IsSVGAElement(*child_node))
+    if (child_node && IsA<SVGAElement>(*child_node))
       return false;
     if (Parent() && Parent()->IsSVG())
       return Parent()->IsChildAllowed(child, style);

third_party/blink/renderer/core/layout/svg/svg_layout_tree_as_text.cc

@@ -373,7 +373,7 @@ static WTF::TextStream& operator<<(WTF::TextStream& ts,
     WriteNameValuePair(ts, "ry",
                        length_context.ValueForLength(svg_style.Ry(), style,
                                                      SVGLengthMode::kHeight));
-  } else if (IsSVGCircleElement(*svg_element)) {
+  } else if (IsA<SVGCircleElement>(*svg_element)) {
     WriteNameValuePair(ts, "cx",
                        length_context.ValueForLength(svg_style.Cx(), style,
                                                      SVGLengthMode::kWidth));

third_party/blink/renderer/core/svg/svg_animate_motion_element.cc

@@ -44,14 +44,14 @@ bool TargetCanHaveMotionTransform(const SVGElement& target) {
   // Spec: SVG 1.1 section 19.2.15
   // FIXME: svgTag is missing. Needs to be checked, if transforming <svg> could
   // cause problems.
-  return IsA<SVGGElement>(target) || IsSVGDefsElement(target) ||
+  return IsA<SVGGElement>(target) || IsA<SVGDefsElement>(target) ||
          IsA<SVGUseElement>(target) || IsA<SVGImageElement>(target) ||
          IsSVGSwitchElement(target) || IsA<SVGPathElement>(target) ||
-         IsA<SVGRectElement>(target) || IsSVGCircleElement(target) ||
+         IsA<SVGRectElement>(target) || IsA<SVGCircleElement>(target) ||
          IsA<SVGEllipseElement>(target) || IsA<SVGLineElement>(target) ||
          IsA<SVGPolylineElement>(target) || IsA<SVGPolygonElement>(target) ||
          IsA<SVGTextElement>(target) || IsA<SVGClipPathElement>(target) ||
-         IsA<SVGMaskElement>(target) || IsSVGAElement(target) ||
+         IsA<SVGMaskElement>(target) || IsA<SVGAElement>(target) ||
          IsA<SVGForeignObjectElement>(target);
 }
 }

third_party/blink/renderer/core/svg/svg_text_path_element.cc

@@ -116,7 +116,7 @@ LayoutObject* SVGTextPathElement::CreateLayoutObject(const ComputedStyle&,
 bool SVGTextPathElement::LayoutObjectIsNeeded(
     const ComputedStyle& style) const {
   if (parentNode() &&
-      (IsSVGAElement(*parentNode()) || IsA<SVGTextElement>(*parentNode())))
+      (IsA<SVGAElement>(*parentNode()) || IsA<SVGTextElement>(*parentNode())))
     return SVGElement::LayoutObjectIsNeeded(style);
 
   return false;

third_party/blink/renderer/core/svg/svg_tspan_element.cc

@@ -35,7 +35,7 @@ LayoutObject* SVGTSpanElement::CreateLayoutObject(const ComputedStyle&,
 
 bool SVGTSpanElement::LayoutObjectIsNeeded(const ComputedStyle& style) const {
   if (parentNode() &&
-      (IsSVGAElement(*parentNode()) || IsA<SVGTextElement>(*parentNode()) ||
+      (IsA<SVGAElement>(*parentNode()) || IsA<SVGTextElement>(*parentNode()) ||
        IsA<SVGTextPathElement>(*parentNode()) ||
        IsA<SVGTSpanElement>(*parentNode())))
     return SVGElement::LayoutObjectIsNeeded(style);

third_party/blink/renderer/core/svg/svg_use_element.cc

@@ -498,7 +498,7 @@ LayoutObject* SVGUseElement::CreateLayoutObject(const ComputedStyle& style,
 
 static bool IsDirectReference(const SVGElement& element) {
   return IsA<SVGPathElement>(element) || IsA<SVGRectElement>(element) ||
-         IsSVGCircleElement(element) || IsA<SVGEllipseElement>(element) ||
+         IsA<SVGCircleElement>(element) || IsA<SVGEllipseElement>(element) ||
          IsA<SVGPolygonElement>(element) || IsA<SVGPolylineElement>(element) ||
          IsA<SVGTextElement>(element);
 }