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

Source/core/svg/SVGAnimatedAngle.cpp

Index: Source/core/svg/SVGAnimatedAngle.cpp
diff --git a/Source/core/svg/SVGAnimatedAngle.cpp b/Source/core/svg/SVGAnimatedAngle.cpp
index ec56a1bdd190ffb94b6833702d5d27fcbd52a253..24a93caadd016c84172ffdb3d281bb86cfb72288 100644
--- a/Source/core/svg/SVGAnimatedAngle.cpp
+++ b/Source/core/svg/SVGAnimatedAngle.cpp
@@ -58,12 +58,6 @@ void SVGAnimatedAngle::synchronizeAttribute()
     contextElement()->setSynchronizedLazyAttribute(attributeName(), value);
 }
 
-void SVGAnimatedAngle::animationStarted()
-{
-    SVGAnimatedProperty<SVGAngle>::animationStarted();
-    m_orientType->animationStarted();
-}
-
 void SVGAnimatedAngle::setAnimatedValue(PassRefPtr<SVGPropertyBase> value)
 {
     SVGAnimatedProperty<SVGAngle>::setAnimatedValue(value);