Remove isSupportedAttribute in svg

Source/core/svg/SVGSVGElement.cpp

Index: Source/core/svg/SVGSVGElement.cpp
diff --git a/Source/core/svg/SVGSVGElement.cpp b/Source/core/svg/SVGSVGElement.cpp
index 283b4b3daee66e343836caba9dd19a7c85ab94f9..975a18185fd47cca234a24f14d969a65d47dc66b 100644
--- a/Source/core/svg/SVGSVGElement.cpp
+++ b/Source/core/svg/SVGSVGElement.cpp
@@ -319,10 +319,9 @@ void SVGSVGElement::svgAttributeChanged(const QualifiedName& attrName)
             object->setNeedsTransformUpdate();
     }
 
-    SVGElement::InvalidationGuard invalidationGuard(this);
-
     if (updateRelativeLengthsOrViewBox
         || SVGZoomAndPan::isKnownAttribute(attrName)) {
+        SVGElement::InvalidationGuard invalidationGuard(this);

[Erik Dahlström (inactive), 2015/04/13 08:11:17]

Note that all the above branches sets updateRelativeLengthsOrViewBox=true, so
we'll hit this codepath for all of the attributes that are handled here.

         if (layoutObject())
             markForLayoutAndParentResourceInvalidation(layoutObject());
         return;