Remove some dead code in SVG "mixins"

third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp

Index: third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp b/third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp
index ada7d6c8b3f69e232ba3c335b143e8efab78366d..0e3db78f08c6813779ea1bfdee1d24566b34e197 100644
--- a/third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGZoomAndPan.cpp
@@ -41,11 +41,6 @@ bool SVGZoomAndPan::isKnownAttribute(const QualifiedName& attrName)
     return attrName == SVGNames::zoomAndPanAttr;
 }
 
-void SVGZoomAndPan::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
-{
-    supportedAttributes.add(SVGNames::zoomAndPanAttr);
-}
-
 static const LChar disable[] =  {'d', 'i', 's', 'a', 'b', 'l', 'e'};
 static const LChar magnify[] =  {'m', 'a', 'g', 'n', 'i', 'f', 'y'};