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

Source/core/svg/properties/SVGAnimatedProperty.cpp

Index: Source/core/svg/properties/SVGAnimatedProperty.cpp
diff --git a/Source/core/svg/properties/SVGAnimatedProperty.cpp b/Source/core/svg/properties/SVGAnimatedProperty.cpp
index 3547d6ea47c04d991ef0bf0a27284a537a45cb77..4dc0420d5ed3be45d1ea22841b022f323c104122 100644
--- a/Source/core/svg/properties/SVGAnimatedProperty.cpp
+++ b/Source/core/svg/properties/SVGAnimatedProperty.cpp
@@ -52,11 +52,6 @@ SVGAnimatedPropertyBase::~SVGAnimatedPropertyBase()
 {
 }
 
-void SVGAnimatedPropertyBase::animationStarted()
-{
-    // FIXME: remove this function and its overrides
-}
-
 void SVGAnimatedPropertyBase::animationEnded()
 {
     synchronizeAttribute();