Use new downcast helper for blink::SVGTextElement

This CL has goal to use IsA<SVGTextElement>(element) in place of
IsSVGTextElement(element)

Bug: 891908
Change-Id: Ie5f192bb485ee66fcc7ba9b0d13082cbcb6b572c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936625
Commit-Queue: Abhijeet | Igalia <abhijeet@igalia.com>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720341}

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

@@ -706,12 +706,13 @@ void StyleAdjuster::AdjustComputedStyle(StyleResolverState& state,
     }
 
     // SVG text layout code expects us to be a block-level style element.
-    if ((IsSVGForeignObjectElement(*element) || IsSVGTextElement(*element)) &&
+    if ((IsSVGForeignObjectElement(*element) ||
+         IsA<SVGTextElement>(*element)) &&
         style.IsDisplayInlineType())
       style.SetDisplay(EDisplay::kBlock);
 
     // Columns don't apply to svg text elements.
-    if (IsSVGTextElement(*element))
+    if (IsA<SVGTextElement>(*element))
       style.ClearMultiCol();
   } else if (element && element->IsMathMLElement()) {
     if (style.Display() == EDisplay::kContents) {

third_party/blink/renderer/core/editing/visible_units.cc

@@ -639,7 +639,7 @@ static PositionTemplate<Strategy> MostBackwardCaretPosition(
     }
 
     // There is no caret position in non-text svg elements.
-    if (current_node->IsSVGElement() && !IsSVGTextElement(current_node))
+    if (current_node->IsSVGElement() && !IsA<SVGTextElement>(current_node))
       continue;
 
     // If we've moved to a position that is visually distinct, return the last
@@ -786,7 +786,7 @@ PositionTemplate<Strategy> MostForwardCaretPosition(
       break;
 
     // There is no caret position in non-text svg elements.
-    if (current_node->IsSVGElement() && !IsSVGTextElement(current_node))
+    if (current_node->IsSVGElement() && !IsA<SVGTextElement>(current_node))
       continue;
 
     // Do not move to a visually distinct position.

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

@@ -50,7 +50,7 @@ bool TargetCanHaveMotionTransform(const SVGElement& target) {
          IsA<SVGRectElement>(target) || IsSVGCircleElement(target) ||
          IsSVGEllipseElement(target) || IsA<SVGLineElement>(target) ||
          IsA<SVGPolylineElement>(target) || IsA<SVGPolygonElement>(target) ||
-         IsSVGTextElement(target) || IsSVGClipPathElement(target) ||
+         IsA<SVGTextElement>(target) || IsSVGClipPathElement(target) ||
          IsSVGMaskElement(target) || IsSVGAElement(target) ||
          IsSVGForeignObjectElement(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()) || IsSVGTextElement(*parentNode())))
+      (IsSVGAElement(*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()) || IsSVGTextElement(*parentNode()) ||
+      (IsSVGAElement(*parentNode()) || IsA<SVGTextElement>(*parentNode()) ||
        IsA<SVGTextPathElement>(*parentNode()) ||
        IsSVGTSpanElement(*parentNode())))
     return SVGElement::LayoutObjectIsNeeded(style);

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

@@ -500,7 +500,7 @@ static bool IsDirectReference(const SVGElement& element) {
   return IsSVGPathElement(element) || IsA<SVGRectElement>(element) ||
          IsSVGCircleElement(element) || IsSVGEllipseElement(element) ||
          IsA<SVGPolygonElement>(element) || IsA<SVGPolylineElement>(element) ||
-         IsSVGTextElement(element);
+         IsA<SVGTextElement>(element);
 }
 
 Path SVGUseElement::ToClipPath() const {