SVG: Remove SVGAnimatedPropertyBase::startAnimation and its overrides which are already all NOOP

Source/core/svg/SVGStaticStringList.cpp

Index: Source/core/svg/SVGStaticStringList.cpp
diff --git a/Source/core/svg/SVGStaticStringList.cpp b/Source/core/svg/SVGStaticStringList.cpp
index 710e5a2e9075400ea87c411a91effb2c1db9eb0b..36b1684cf717ca9b81e257ec883e23bf3a3fa5ca 100644
--- a/Source/core/svg/SVGStaticStringList.cpp
+++ b/Source/core/svg/SVGStaticStringList.cpp
@@ -54,11 +54,6 @@ bool SVGStaticStringList::isAnimating() const
     return false;
 }
 
-void SVGStaticStringList::animationStarted()
-{
-    ASSERT_NOT_REACHED();
-}
-
 PassRefPtr<SVGPropertyBase> SVGStaticStringList::createAnimatedValue()
 {
     ASSERT_NOT_REACHED();